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Prof Rottinghaus
MAC 209 A
Date
Reading Name
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pellendandis et officit, ut ex eaquatisquam eaquias enecti aut
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Quotes
“Archilitem volut arum idem veniat latur, nullit dis rae. Sumet
pellendandis et officit, ut ex eaquatisquam eaquias enecti aut
intem aut quas volecabo. Or sum ullacep ratur? Aruptatendi re
quaere, simpelisit et harchil ilis” (p.xx).
“Officid magnihilis aut pro omnis reprae sant mi, quo inciis sum
harumquunde voles doluptum et ut omnis adis nonsedis non pe
veri ut quassit quatur aut aperspelles molut quia” (p.xx).
“Ehenit, sus. Solupta plabo. Luptas ut quaerio id est, audit
aliam, volor aliqui dit quae dolum volupta que experatet”
(p.xx).
Summary
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event aboribusdae nam exero mo doleceatet et dolore aut que
exerupictur, utem aut et, sunt maximendunt quam quis ipid qui
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expero et officipsae. Ita vellitat. Ihita apiendissi reculla boreper
ionectur andis andanduntem quo odit, officit volutecta quis ne
venis repudaestion etus aute rerem. Officid dolore magnihilis
aut pro omnis reprae sant mi, quo inciis sum harumquunde voles
doluptum et ut omnis adis nonsedis non pe veri ut quassit quatur
aut aperspelles molut quia consecta peruptatur re, ut oditist aut
quas as aut quatur, utem et, cone quis ex et assunt.
MLA/APA/Chicago Citation:
EXAMPLE: Author. (Year) “Title of Article,” Name of Journal.
Issue/Vol.
Project Management
Chapter 8
8 | *
Copyright © Cengage Learning. All rights reserved.
Learning Objectives
Define the term project, list the steps involved in project
management, and explain the role of the project manager.
Describe various project management tools and techniques, such
as work breakdown structure, critical path method, program
evaluation and review technique, cost and time tradeoff, and
resource management.
Understand how to execute project successfully and how to
avoid risks and failure.
8 | *
Copyright © Cengage Learning. All rights reserved.
Elements of Project Management
To identify the elements of project management
we need to answer two questions:
What is a project?
What is Project Management?
And then we need to also consider the role of:
The Project Manager
*
8 | *
Copyright © Cengage Learning. All rights reserved.
What is a Project?Project: a set of interrelated activities
necessary to achieve established goals using a specified amount
of time, budget, and resourcesThe primary characteristics are:
A well-defined goal or objective
Composed of a set of interrelated activities
A specified beginning and ending time
Specified resource and personnel requirements
A specified budget
Uniqueness
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Copyright © Cengage Learning. All rights reserved.
Supplementary
Characteristics for Projects
Projects generally have or include:
Pre-specified deliverables after completion
Pre-established limits and exclusions
Specific intermediate goals or performance milestones.
An element of risk
Teams made up of several individuals who come from different
departments or functional areas or who have unique skills
Team members work are working on multiple projects at the
same time
Source: © Image Source/Corbis
*
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Copyright © Cengage Learning. All rights reserved.
Examples of
Operations Management ProjectsThe development of new
product and service offerings such as Nintendo Wii, Sony
Playstation, and Microsoft-X-Box.Quality improvement projects
such as implementation of Six Sigma projects at a large service
organization like American Express.Preparation for ISO9000 or
ISO14000 certifications.
*
8 | *
Copyright © Cengage Learning. All rights reserved.
What is Product ManagementProject management: the
application of the knowledge, skills, tools, and techniques
necessary to successfully complete a project.According to the
Project Management Institute (www.pmi.org), the body of
knowledge of project management can be divided into five
categories:
initiation
planning
execution
control
closure
*
8 | *
Copyright © Cengage Learning. All rights reserved.
Project InitiationDuring the project initiation phase, a business
problem or opportunity is identified, a solution is identified and
a project team is established.The project manager is ultimately
responsible for the successful execution of the project.The
Project Management Institution recommends that project
managers need to gain expertise in areas such as: information
integrations, scope, time, cost, quality, human resources,
communications, risk, and procurement.
Source: © Image Source/Corbis
*
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Copyright © Cengage Learning. All rights reserved.
Discussion Starter
What are Project Champions?
*
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Copyright © Cengage Learning. All rights reserved.
Project PlanningInvolves the creation of a number of planning
documents such as:
Project plan
Resource plan
Financial plan
Quality plans
Communications plan
Risk plan
8 | *
Copyright © Cengage Learning. All rights reserved.
Project ExecutionInvolves the actual completion of all activities
that are part of the project.Requires the project manager to start
constructing the deliverables.The deliverables can be sequenced
in series so that neither the project team nor the recipient is
overburdened by them.
*
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Copyright © Cengage Learning. All rights reserved.
Project ControlIs the real-time assessment of the execution of a
planned projectRequires time, cost, quality, resource, risk, and
change management skillsHardest job for a project manager
*
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Copyright © Cengage Learning. All rights reserved.
Project ClosureAt the conclusion of all project activities and
after submission of the required deliverables, a project is
formally closed.Conducting a critical assessment of all project
phases that went well and those that did not allows the
organization to learn and to improve the execution of the next
project.
8 | *
Copyright © Cengage Learning. All rights reserved.
The Project ManagerProject manager: the person responsible for
delivering the goals of a projectProject time: the amount of time
available to complete a projectProject cost: the budgeted
amount available for the projectProject scope: the activities that
must be completed to achieve a project’s end goal
*
8 | *
Copyright © Cengage Learning. All rights reserved.
Figure 8.1: Three Interrelated
Constraints in Project Management
8 | *
Copyright © Cengage Learning. All rights reserved.
Project Management
Tools and TechniquesThe discipline of project management has
available a number of tools and procedures that enable the
project team to organize its work to meet the constraints:
Work Breakdown Structure
Precedence Relationship and Time Estimates
Gantt Chart
Network Diagram
Critical Path Method (CPM)
Cost and Time Tradeoff Analysis
Program Evaluation and Review Technique (PERT)
Resource Management
*
8 | *
Copyright © Cengage Learning. All rights reserved.
Work Breakdown StructureWork breakdown structure (WBS):
an approach that defines a project in terms of its subprojects,
tasks, and activities
Most fundamental technique for designing and
organizingActivity: the smallest work package that can be
assigned to a single worker or a teamIt is essential that care is
taken to develop a realistic work breakdown structure.
*
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Copyright © Cengage Learning. All rights reserved.
Figure 8.2: Work Breakdown Structure
8 | *
Copyright © Cengage Learning. All rights reserved.
Precedence Relationship
and Time EstimatesPrecedence relationship analysis:
identification of the relationships and the sequence of activities
within a projectGreat care is taken to estimate the approximate
completion time for each activity.The project schedule, cost,
and resource requirements depend on the precedence
relationships and time estimates for individual tasks.
8 | *
Copyright © Cengage Learning. All rights reserved.
Gantt ChartGantt chart: a special type of horizontal bar chart
used to display the schedule for an entire projectNamed after
Henry Gantt, who originally developed the chart in the 1910s.A
Gantt chart with different color codes can be used to track
performance while the project is in progress.
8 | *
Copyright © Cengage Learning. All rights reserved.
Figure 8.3: An
Example of a Gantt Chart
8 | *
Copyright © Cengage Learning. All rights reserved.
Network DiagramNetwork diagram: a diagram with arrows and
nodes (circles) created to display a sequence of activities within
a projectActivity on node (AON) approach: a network diagram
that shows each activity as a circle (or a node) and connects the
activities with arrowsActivity on arrow (AOA) convention: a
network diagram in which each activity is represented by an
arrow, and the nodes are used to show the beginning and end
points
*
8 | *
Copyright © Cengage Learning. All rights reserved.
Figure 8.5: Activity on Node (AON)
and Activity on Arrow (AOA) Conventions
for Representing Network Diagrams
*
8 | *
Copyright © Cengage Learning. All rights reserved.
Figure 8.7: AON Network Diagram
for Sunny Beach Resort Project
*
8 | *
Copyright © Cengage Learning. All rights reserved.
Critical Path MethodCritical path method: an algorithm for
scheduling activities within a project for the fastest and most
efficient executionCritical path: the path within a project that
takes the longest time to complete
Dictates the project completion time
a.k.a.: the bottleneck path or the binding constraintCritical
activities: the project activities making up a critical pathSlack:
the amount of flexibility in scheduling an activity within a
project
*
8 | *
Copyright © Cengage Learning. All rights reserved.
Identifying the Critical Path
The algorithm involves calculating four parameters
for each activity:
Early start time (ES): the earliest time at which an activity can
start, considering the beginning and ending for each of the
preceding activities
Early finish time (EF): the sum of the early start time (ES) and
the time required to complete the activity
Late state time (LS): the latest time at which an activity can
start, considering all the precedence relationships, without
delaying the completion time for the project
Late finish time (LF): the sum of the late start time and the time
required to complete the activity
*
8 | *
Copyright © Cengage Learning. All rights reserved.
Figure 8.9: Convention for Displaying the Earliest and Latest
Start and Finish Times
8 | *
Copyright © Cengage Learning. All rights reserved.
Cost and Time Tradeoff AnalysisSometimes the most efficient
schedule is not sufficient for meeting customer needs.
The scope of the project may need to be changed or additional
resources may need to be assigned to speed up the project.If the
scope of the project is changed, the project team can reevaluate
the schedule based on the new guidelines using the critical path
method.If additional resources are assigned to speed up the
project schedule, a cost and time tradeoff analysis (crashing) is
conducted.Crashing: an approach for identifying the lowest-cost
approach for reducing the project duration
*
8 | *
Copyright © Cengage Learning. All rights reserved.
Table 8.2: Sunny Beach Resort: Activity Relationships and
Time Estimates
*
8 | *
Copyright © Cengage Learning. All rights reserved.
Figure 8.17: Additional
Project Cost Versus Duration
8 | *
Copyright © Cengage Learning. All rights reserved.
Program Evaluation
and Review Technique (PERT)Program evaluation and review
technique: a technique for addressing the impact of
uncertainties in activity time estimates on the duration of the
entire projectIn a project schedule, different estimates for
activity times are developed:
Optimistic time (to): the minimum possible time required to
complete an activity, assuming that everything proceeds better
than is normally expected
Pessimistic time (tp): the maximum possible time required to
complete ac activity, assuming that everything proceeds at the
slowest possible pace
Most likely time (tm): the best estimate of the time required to
accomplish a task assuming that everything proceeds normally
Expected time (te): the best estimate of the time required to
accomplish an activity considering the potential impact
of to, tm, and tp
*
8 | *
Copyright © Cengage Learning. All rights reserved.
Figure 8.18: Potential
Distributions of Activity Times
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Copyright © Cengage Learning. All rights reserved.
Resource ManagementTwo commonly used techniques are:
Resource breakdown structure (RBS): a standardized list of
personnel required to complete various activities in a project
Resource leveling: an approach to reduce the amount of
fluctuations in day-to-day resource requirements within an
organization
*
8 | *
Copyright © Cengage Learning. All rights reserved.
Figure 8.26: Resource Requirements
in Multiproject Environments
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Copyright © Cengage Learning. All rights reserved.
Project Management SoftwareA large number of concepts, tools
and techniques for project management have been introduced
since the 1950s, and their use has become quite widespread in
recent years.Several reasons for this increase in the use of
project management techniques:
Globally diverse workforce
Multi-project environments
Availability of user-friendly software
*
8 | *
Copyright © Cengage Learning. All rights reserved.
Success Factors
in Project ManagementWhy Do Projects Fail?Project Risk
ManagementWhy Do Projects Succeed?
*
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Project Risk ManagementEven with careful planning, it is not
possible to anticipate everything that can put a project’s scope,
schedule, or budget at risk. A careful manager develops plans
for managing various risks associated with the projects.Four
categories of risks:
Financial Resource Risk
Human Resource Risk
Supply Risk
Quality Risk
*
8 | *
Copyright © Cengage Learning. All rights reserved.
Risk Assessment Plan
Step 1: Identify problems (and map them).
Problems are classified according to:
Severity: What percentage of the project’s scope will be
affected by a problem?
Probability: What are the chances that a specific problem will
occur?
Timing: At what point in the project is the specific problem
likely to appear?
Dynamic risk: As the project proceeds, will the probability of
the problem occurrence increase, decrease, or stay constant?
*
8 | *
Copyright © Cengage Learning. All rights reserved.
Table 8.9: Project Risk Map Template
*
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Copyright © Cengage Learning. All rights reserved.
Risk Assessment Plan continued
Step 2: Analyze each potential problem.
The project manager should quantify the impact of each
potential problem such as time delays or cost overruns.
Step 3: Once the risks are presented on the same scale, develop
a prioritization scheme.
Step 4: Develop a contingency plan.
Done by the project team
Step 5: Develop a potential upside for the project.
Done by the project manager
Step 6: Assign team members the responsibility for monitoring
the signs of each potential problem.
*
8 | *
Copyright © Cengage Learning. All rights reserved.
Risk RegisterProjects Teams will define the various risks and
document these issues.Each risk will have a “potential
solution.”One owner will be assigned the risk.Living document
– dynamic – will change
*
8 | *
Copyright © Cengage Learning. All rights reserved.
Why Do Projects Succeed?Clearly Defined Goals
Is there a clear and written-down objective for the project?
Are the main tasks structured?
Has the scope of the project been agreed upon?
Does the team know and agree with the goals?
Are there clear milestones along the way?Project Manager
Ability
Is the project manager skilled and experienced?
Does the project manager have a plan and a budget?
Does the project manager have technical knowledge in the area
of the project?
Does the project manager have leadership skills?
Can the project manager motivate the team?
*
8 | *
Copyright © Cengage Learning. All rights reserved.
Why Do Projects Succeed?Team Member Skills
Do we know what skills are required on this project?
Does the team have all these skills?
Is there a training program for team members?
Is there a range of skills and experience on the project?
Are people there because of what they bring to the project and
not due to their position in the organization?Top Management
Support
Is there support from top management for the project?
Does the project have a champion in top management?
Have adequate resources been allocated to the project?
Does top management have a stake in the outcome of the
project?
Does the project fit with organization objectives?
*
8 | *
Copyright © Cengage Learning. All rights reserved.
Why Do Projects Succeed?
Project Planning
Is there a clear method for achieving the project?
Has a plan for the project life been prepared from this method?
Is there good short-term planning?
Is progress measured against plan?
Is the plan adjusted to match progress?Communication
Are there clear channels of communication to all parties on the
project?
Can team members discuss issues openly?
Can team members communicate their opinions on decisions?
Do team members get feedback on performance?
Do team members trust each other enough to communicate
freely at all times?
*
8 | *
Copyright © Cengage Learning. All rights reserved.
Why Do Projects Succeed?User Involvement
Do we know the end users of the project?
Have the end users been involved in setting the project
outcomes?
Is it easy for end users to get involved in the project?
Do the end users give feedback on progress?
Do the end users have ownership of the solution? Commitment
of Team
Are team members behind the goals of the project?
Do the team members own the project outcome?
Are team members involved in decision making?
Can team members make suggestions about improving and
changing the project?
Do team members go beyond their job description for the good
of the project?
*
8 | *
Copyright © Cengage Learning. All rights reserved.
Why Do Projects Succeed?Control Systems
Does the project have a control system?
Do we check planned time and cost against actual duration and
expenditure?
Are checks carried out early enough to detect problems and
correct them?
Do we give feedback on progress to the team?
Do we check that action on feedback is effective?Risk
Management
Have key risks on the project been identified?
Has the effect of each risk been measured?
Have responses been decided for key risks?
Have action plans been prepared for each response?
Does the team have a plan for managing unexpected risks?
*
Optimization and Simulation Modeling
Chapter 9
9 | *
Copyright © Cengage Learning. All rights reserved.
Learning Objectives
Formulate and solve linear programming problems.
Describe the use of computer simulation modeling in operations
decision making.
9 | *
Copyright © Cengage Learning. All rights reserved.
Linear Programming Helps Kellogg’s Optimize Production,
Inventory, and DistributionKellogg’s must manage a highly
complex production, inventory control, and distribution
system.Kellogg’s employs an enterprise resource planning
(ERP) system to coordinate its raw material purchases,
production, distribution, and demand.The many different
varieties of products and brands, packaged in many different
sizes and produced at several different plants, require the use of
an optimization approach known as linear programming.The
innovative use of optimization techniques has allowed the
company to develop a system that is estimated to save between
$35 million and $40 million annually.
9 | *
Copyright © Cengage Learning. All rights reserved.
Discussion Starter
What benefits can we receive from simulations and modeling?
9 | *
Copyright © Cengage Learning. All rights reserved.
Operations Research
or Management ScienceOperations research or management
science: the use of interdisciplinary scientific methods such as
mathematical modeling, statistics, and algorithms that aid
decision making for complex real-world problems of
coordination and execution of the operations in an
organizationThe goal is to derive the best possible solution to a
problem or to optimize the performance of the organization.
Source: © Image Source/Corbis
9 | *
Copyright © Cengage Learning. All rights reserved.
IntroductionMany management decisions involve making the
most effective use of limited resourcesLinear programming (LP)
Widely used mathematical modeling technique
Planning and decision making relative to resource
allocationBroader field of mathematical programming
Here programming refers to modeling and solving a problem
mathematically
Copyright ©2015 Pearson Education, Inc.
9 | *
Copyright © Cengage Learning. All rights reserved.
Requirements of a
Linear Programming ProblemFour properties in common
Seek to maximize or minimize some quantity (the objective
function)
Restrictions or constraints are present
Alternative courses of action are available
Linear equations or inequalities
Copyright ©2015 Pearson Education, Inc.
9 | *
Copyright © Cengage Learning. All rights reserved.
LP Properties and Assumptions
TABLE 7.1
Copyright ©2015 Pearson Education, Inc.PROPERTIES OF
LINEAR PROGRAMS1. One objective function2. One or more
constraints3. Alternative courses of action4. Objective
function and constraints are linear – proportionality and
divisibility5. Certainty6. Divisibility7. Nonnegative variables
9 | *
Copyright © Cengage Learning. All rights reserved.
Formulating LP ProblemsDeveloping a mathematical model to
represent the managerial problemSteps in formulating a LP
problem
Completely understand the managerial problem being faced
Identify the objective and the constraints
Define the decision variables
Use the decision variables to write mathematical expressions for
the objective function and the constraints
9 | *
Copyright © Cengage Learning. All rights reserved.
Formulating LP ProblemsCommon LP application – product mix
problemTwo or more products are produced using limited
resources Maximize profit based on the profit contribution per
unit of each productDetermine how many units of each product
to produce
Copyright ©2015 Pearson Education, Inc.
9 | *
Copyright © Cengage Learning. All rights reserved.
Flair Furniture CompanyFlair Furniture produces inexpensive
tables and chairsProcesses are similar, both require carpentry
work and painting and varnishing
Each table takes 4 hours of carpentry and 2 hours of painting
and varnishing
Each chair requires 3 of carpentry and 1 hour of painting and
varnishing
There are 240 hours of carpentry time available and 100 hours
of painting and varnishing
Each table yields a profit of $70 and each chair a profit of $50
Copyright ©2015 Pearson Education, Inc.
9 | *
Copyright © Cengage Learning. All rights reserved.
Flair Furniture CompanyThe company wants to determine the
best combination of tables and chairs to produce to reach the
maximum profit
TABLE 7.2
Copyright ©2015 Pearson Education, Inc.HOURS REQUIRED
TO PRODUCE 1 UNITDEPARTMENT(T) TABLES(C)
CHAIRSAVAILABLE HOURS THIS
WEEKCarpentry43240Painting and varnishing21100Profit per
unit$70$50
9 | *
Copyright © Cengage Learning. All rights reserved.
Flair Furniture CompanyThe objective is
Maximize profitThe constraints are
The hours of carpentry time used cannot exceed 240 hours per
week
The hours of painting and varnishing time used cannot exceed
100 hours per weekThe decision variables are
T = number of tables to be produced per week
C = number of chairs to be produced per week
Copyright ©2015 Pearson Education, Inc.
9 | *
Copyright © Cengage Learning. All rights reserved.
Flair Furniture CompanyCreate objective function in terms of T
and C
Maximize profit = $70T + $50CDevelop mathematical
relationships for the two constraints
For carpentry, total time used is
(4 hours per table)(Number of tables produced)
+ (3 hours per chair)(Number of chairs produced)
First constraint is
Carpentry time used ≤ Carpentry time available
4T + 3C ≤ 240 (hours of carpentry time)
Copyright ©2015 Pearson Education, Inc.
9 | *
Copyright © Cengage Learning. All rights reserved.
Flair Furniture CompanySimilarly
Painting and varnishing time used
≤ Painting and varnishing time available
2 T + 1C ≤ 100 (hours of painting and varnishing time)
This means that each table produced requires two hours of
painting and varnishing time
Both of these constraints restrict production capacity and affect
total profit
Copyright ©2015 Pearson Education, Inc.
9 | *
Copyright © Cengage Learning. All rights reserved.
Flair Furniture CompanyThe values for T and C must be
nonnegative
T ≥ 0 (number of tables produced is greater than or equal to 0)
C ≥ 0 (number of chairs produced is greater than or equal to 0)
The complete problem stated mathematically
Maximize profit = $70T + $50C
Copyright ©2015 Pearson Education, Inc.
subject to
4T + 3C ≤240(carpentry constraint)
2T + 1C ≤100(painting and varnishing constraint)
T, C ≥0(nonnegativity constraint)
9 | *
Copyright © Cengage Learning. All rights reserved.
Graphical
Solution
to an
LP ProblemEasiest way to solve a small LP problems is
graphicallyOnly works when there are just two decision
variables
Not possible to plot a solution for more than two
variablesProvides valuable insight into how other approaches
workNonnegativity constraints mean that we are always
working in the first (or northeast) quadrant of a graph
Copyright ©2015 Pearson Education, Inc.
9 | *
Copyright © Cengage Learning. All rights reserved.
Graphical Representation
of Constraints
This Axis Represents the Constraint T ≥ 0
This Axis Represents the Constraint C ≥ 0
FIGURE 7.1 – Quadrant Containing All Positive Values
Copyright ©2015 Pearson Education, Inc.
100 –
–
80 –
–
60 –
–
40 –
–
20 –
–
C
||||||||||||
020406080100
T
Number of Chairs
Number of Tables
9 | *
Copyright © Cengage Learning. All rights reserved.
Graphical Representation
of ConstraintsThe first step is to identify a set or region of
feasible solutionsPlot each constraint equation on a graphGraph
the equality portion of the constraint equations
4T + 3C = 240Solve for the axis intercepts and draw the line
Copyright ©2015 Pearson Education, Inc.
9 | *
Copyright © Cengage Learning. All rights reserved.
Graphical Representation
of ConstraintsWhen Flair produces no tables, the carpentry
constraint is:
4(0) + 3C = 240
3C = 240
C = 80Similarly for no chairs:
4T + 3(0) = 240
4T = 240
T = 60
This line is shown on the following graph
Copyright ©2015 Pearson Education, Inc.
9 | *
Copyright © Cengage Learning. All rights reserved.
Graphical Representation
of Constraints
(T = 0, C = 80)
FIGURE 7.2 – Graph of Carpentry Constraint Equation
(T = 60, C = 0)
Copyright ©2015 Pearson Education, Inc.
100 –
–
80 –
–
60 –
–
40 –
–
20 –
–
C
||||||||||||
020406080100
T
Number of Chairs
Number of Tables
9 | *
Copyright © Cengage Learning. All rights reserved.
FIGURE 7.3 – Region that Satisfies the Carpentry Constraint
Graphical Representation
of ConstraintsAny point on or below the constraint plot will not
violate the restrictionAny point above the plot will violate the
restriction
Copyright ©2015 Pearson Education, Inc.
100 –
–
80 –
–
60 –
–
40 –
–
20 –
–
C
||||||||||||
020406080100
T
Number of Chairs
Number of Tables
(30, 40)
(30, 20)
(70, 40)
9 | *
Copyright © Cengage Learning. All rights reserved.
Graphical Representation
of ConstraintsThe point (30, 40) lies on the line and exactly
satisfies the constraint
4(30) + 3(40) = 240The point (30, 20) lies below the line and
satisfies the constraint
4(30) + 3(20) = 180The point (70, 40) lies above the line and
does not satisfy the constraint
4(70) + 3(40) = 400
Copyright ©2015 Pearson Education, Inc.
9 | *
Copyright © Cengage Learning. All rights reserved.
Graphical Representation
of Constraints
(T = 0, C = 100)
FIGURE 7.4 – Region that Satisfies the Painting and Varnishing
Constraint
(T = 50, C = 0)
Copyright ©2015 Pearson Education, Inc.
100 –
–
80 –
–
60 –
–
40 –
–
20 –
–
C
||||||||||||
020406080100
T
Number of Chairs
Number of Tables
9 | *
Copyright © Cengage Learning. All rights reserved.
Graphical Representation
of ConstraintsTo produce tables and chairs, both departments
must be usedFind a solution that satisfies both constraints
simultaneouslyA new graph shows both constraint plotsThe
feasible region is where all constraints are satisfied
Any point inside this region is a feasible solution
Any point outside the region is an infeasible solution
Copyright ©2015 Pearson Education, Inc.
9 | *
Copyright © Cengage Learning. All rights reserved.
Graphical Representation
of Constraints
FIGURE 7.5 – Feasible
Prof RottinghausMAC 209 ADateReading Name QuestionArch.docx

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  • 1. Prof Rottinghaus MAC 209 A Date Reading Name Question Archilitem volut arum idem veniat latur, nullit dis rae. Sumet pellendandis et officit, ut ex eaquatisquam eaquias enecti aut intem aut quas volecabo? Quotes “Archilitem volut arum idem veniat latur, nullit dis rae. Sumet pellendandis et officit, ut ex eaquatisquam eaquias enecti aut intem aut quas volecabo. Or sum ullacep ratur? Aruptatendi re quaere, simpelisit et harchil ilis” (p.xx). “Officid magnihilis aut pro omnis reprae sant mi, quo inciis sum harumquunde voles doluptum et ut omnis adis nonsedis non pe veri ut quassit quatur aut aperspelles molut quia” (p.xx). “Ehenit, sus. Solupta plabo. Luptas ut quaerio id est, audit aliam, volor aliqui dit quae dolum volupta que experatet” (p.xx). Summary Archilitem volut arum idem veniat latur, nullit dis rae. Sumet pellendandis et officit, ut ex eaquatisquam eaquias enecti aut intem aut quas modite volecabo. Or sum ullacep ratur? Aruptatendi re quaere, simpelisit et harchil ilis explant ipsa corum reperum, ommo il idunt, sum ipient vellori alia aessimpor auda parit pernam nis solum dolorerciet latquatur, optatquunt que voluptur, il mi, odit ut am, ipis aspiet ea ex eume volum renti ati tem harum adigendem velit quisci non nonest es dusae
  • 2. voles eiur alia quatet facerumquis rehenisin core non cus eum faccae quoditiis et est, quas doloribus estrum, unt. Ehenit, sus. Solupta plabo. Luptas ut quaerio id est, audit aliam, volor aliqui dit quae dolum volupta que experatet aut harum rem event aboribusdae nam exero mo doleceatet et dolore aut que exerupictur, utem aut et, sunt maximendunt quam quis ipid qui aut eos eum illupictem niendi qui corrorporrum qui ut aliquo quis eum consed que quis rest molupta quam etur, consere stiant occuste et quam dolum dolore facerror rerro vollaccum et lam hici ni utem sedi amuscias escimi, omnimi, occatem qui nobis expero et officipsae. Ita vellitat. Ihita apiendissi reculla boreper ionectur andis andanduntem quo odit, officit volutecta quis ne venis repudaestion etus aute rerem. Officid dolore magnihilis aut pro omnis reprae sant mi, quo inciis sum harumquunde voles doluptum et ut omnis adis nonsedis non pe veri ut quassit quatur aut aperspelles molut quia consecta peruptatur re, ut oditist aut quas as aut quatur, utem et, cone quis ex et assunt. MLA/APA/Chicago Citation: EXAMPLE: Author. (Year) “Title of Article,” Name of Journal. Issue/Vol. Project Management Chapter 8
  • 3. 8 | * Copyright © Cengage Learning. All rights reserved. Learning Objectives Define the term project, list the steps involved in project management, and explain the role of the project manager. Describe various project management tools and techniques, such as work breakdown structure, critical path method, program evaluation and review technique, cost and time tradeoff, and resource management. Understand how to execute project successfully and how to avoid risks and failure. 8 | * Copyright © Cengage Learning. All rights reserved. Elements of Project Management To identify the elements of project management we need to answer two questions: What is a project? What is Project Management? And then we need to also consider the role of: The Project Manager * 8 | * Copyright © Cengage Learning. All rights reserved. What is a Project?Project: a set of interrelated activities necessary to achieve established goals using a specified amount
  • 4. of time, budget, and resourcesThe primary characteristics are: A well-defined goal or objective Composed of a set of interrelated activities A specified beginning and ending time Specified resource and personnel requirements A specified budget Uniqueness 8 | * Copyright © Cengage Learning. All rights reserved. Supplementary Characteristics for Projects Projects generally have or include: Pre-specified deliverables after completion Pre-established limits and exclusions Specific intermediate goals or performance milestones. An element of risk Teams made up of several individuals who come from different departments or functional areas or who have unique skills Team members work are working on multiple projects at the same time Source: © Image Source/Corbis * 8 | * Copyright © Cengage Learning. All rights reserved. Examples of
  • 5. Operations Management ProjectsThe development of new product and service offerings such as Nintendo Wii, Sony Playstation, and Microsoft-X-Box.Quality improvement projects such as implementation of Six Sigma projects at a large service organization like American Express.Preparation for ISO9000 or ISO14000 certifications. * 8 | * Copyright © Cengage Learning. All rights reserved. What is Product ManagementProject management: the application of the knowledge, skills, tools, and techniques necessary to successfully complete a project.According to the Project Management Institute (www.pmi.org), the body of knowledge of project management can be divided into five categories: initiation planning execution control closure * 8 | * Copyright © Cengage Learning. All rights reserved. Project InitiationDuring the project initiation phase, a business
  • 6. problem or opportunity is identified, a solution is identified and a project team is established.The project manager is ultimately responsible for the successful execution of the project.The Project Management Institution recommends that project managers need to gain expertise in areas such as: information integrations, scope, time, cost, quality, human resources, communications, risk, and procurement. Source: © Image Source/Corbis * 8 | * Copyright © Cengage Learning. All rights reserved. Discussion Starter What are Project Champions? * 8 | * Copyright © Cengage Learning. All rights reserved. Project PlanningInvolves the creation of a number of planning documents such as: Project plan Resource plan
  • 7. Financial plan Quality plans Communications plan Risk plan 8 | * Copyright © Cengage Learning. All rights reserved. Project ExecutionInvolves the actual completion of all activities that are part of the project.Requires the project manager to start constructing the deliverables.The deliverables can be sequenced in series so that neither the project team nor the recipient is overburdened by them. * 8 | * Copyright © Cengage Learning. All rights reserved. Project ControlIs the real-time assessment of the execution of a planned projectRequires time, cost, quality, resource, risk, and change management skillsHardest job for a project manager * 8 | * Copyright © Cengage Learning. All rights reserved. Project ClosureAt the conclusion of all project activities and
  • 8. after submission of the required deliverables, a project is formally closed.Conducting a critical assessment of all project phases that went well and those that did not allows the organization to learn and to improve the execution of the next project. 8 | * Copyright © Cengage Learning. All rights reserved. The Project ManagerProject manager: the person responsible for delivering the goals of a projectProject time: the amount of time available to complete a projectProject cost: the budgeted amount available for the projectProject scope: the activities that must be completed to achieve a project’s end goal * 8 | * Copyright © Cengage Learning. All rights reserved. Figure 8.1: Three Interrelated Constraints in Project Management 8 | * Copyright © Cengage Learning. All rights reserved. Project Management Tools and TechniquesThe discipline of project management has available a number of tools and procedures that enable the
  • 9. project team to organize its work to meet the constraints: Work Breakdown Structure Precedence Relationship and Time Estimates Gantt Chart Network Diagram Critical Path Method (CPM) Cost and Time Tradeoff Analysis Program Evaluation and Review Technique (PERT) Resource Management * 8 | * Copyright © Cengage Learning. All rights reserved. Work Breakdown StructureWork breakdown structure (WBS): an approach that defines a project in terms of its subprojects, tasks, and activities Most fundamental technique for designing and organizingActivity: the smallest work package that can be assigned to a single worker or a teamIt is essential that care is taken to develop a realistic work breakdown structure. * 8 | * Copyright © Cengage Learning. All rights reserved. Figure 8.2: Work Breakdown Structure
  • 10. 8 | * Copyright © Cengage Learning. All rights reserved. Precedence Relationship and Time EstimatesPrecedence relationship analysis: identification of the relationships and the sequence of activities within a projectGreat care is taken to estimate the approximate completion time for each activity.The project schedule, cost, and resource requirements depend on the precedence relationships and time estimates for individual tasks. 8 | * Copyright © Cengage Learning. All rights reserved. Gantt ChartGantt chart: a special type of horizontal bar chart used to display the schedule for an entire projectNamed after Henry Gantt, who originally developed the chart in the 1910s.A Gantt chart with different color codes can be used to track performance while the project is in progress. 8 | * Copyright © Cengage Learning. All rights reserved. Figure 8.3: An Example of a Gantt Chart 8 | * Copyright © Cengage Learning. All rights reserved. Network DiagramNetwork diagram: a diagram with arrows and
  • 11. nodes (circles) created to display a sequence of activities within a projectActivity on node (AON) approach: a network diagram that shows each activity as a circle (or a node) and connects the activities with arrowsActivity on arrow (AOA) convention: a network diagram in which each activity is represented by an arrow, and the nodes are used to show the beginning and end points * 8 | * Copyright © Cengage Learning. All rights reserved. Figure 8.5: Activity on Node (AON) and Activity on Arrow (AOA) Conventions for Representing Network Diagrams * 8 | * Copyright © Cengage Learning. All rights reserved. Figure 8.7: AON Network Diagram for Sunny Beach Resort Project
  • 12. * 8 | * Copyright © Cengage Learning. All rights reserved. Critical Path MethodCritical path method: an algorithm for scheduling activities within a project for the fastest and most efficient executionCritical path: the path within a project that takes the longest time to complete Dictates the project completion time a.k.a.: the bottleneck path or the binding constraintCritical activities: the project activities making up a critical pathSlack: the amount of flexibility in scheduling an activity within a project * 8 | * Copyright © Cengage Learning. All rights reserved. Identifying the Critical Path The algorithm involves calculating four parameters for each activity: Early start time (ES): the earliest time at which an activity can start, considering the beginning and ending for each of the preceding activities Early finish time (EF): the sum of the early start time (ES) and the time required to complete the activity Late state time (LS): the latest time at which an activity can start, considering all the precedence relationships, without delaying the completion time for the project Late finish time (LF): the sum of the late start time and the time
  • 13. required to complete the activity * 8 | * Copyright © Cengage Learning. All rights reserved. Figure 8.9: Convention for Displaying the Earliest and Latest Start and Finish Times 8 | * Copyright © Cengage Learning. All rights reserved. Cost and Time Tradeoff AnalysisSometimes the most efficient schedule is not sufficient for meeting customer needs. The scope of the project may need to be changed or additional resources may need to be assigned to speed up the project.If the scope of the project is changed, the project team can reevaluate the schedule based on the new guidelines using the critical path method.If additional resources are assigned to speed up the project schedule, a cost and time tradeoff analysis (crashing) is conducted.Crashing: an approach for identifying the lowest-cost approach for reducing the project duration * 8 | * Copyright © Cengage Learning. All rights reserved.
  • 14. Table 8.2: Sunny Beach Resort: Activity Relationships and Time Estimates * 8 | * Copyright © Cengage Learning. All rights reserved. Figure 8.17: Additional Project Cost Versus Duration 8 | * Copyright © Cengage Learning. All rights reserved. Program Evaluation and Review Technique (PERT)Program evaluation and review technique: a technique for addressing the impact of uncertainties in activity time estimates on the duration of the entire projectIn a project schedule, different estimates for activity times are developed: Optimistic time (to): the minimum possible time required to complete an activity, assuming that everything proceeds better than is normally expected Pessimistic time (tp): the maximum possible time required to complete ac activity, assuming that everything proceeds at the slowest possible pace Most likely time (tm): the best estimate of the time required to accomplish a task assuming that everything proceeds normally
  • 15. Expected time (te): the best estimate of the time required to accomplish an activity considering the potential impact of to, tm, and tp * 8 | * Copyright © Cengage Learning. All rights reserved. Figure 8.18: Potential Distributions of Activity Times 8 | * Copyright © Cengage Learning. All rights reserved. Resource ManagementTwo commonly used techniques are: Resource breakdown structure (RBS): a standardized list of personnel required to complete various activities in a project Resource leveling: an approach to reduce the amount of fluctuations in day-to-day resource requirements within an organization * 8 | * Copyright © Cengage Learning. All rights reserved.
  • 16. Figure 8.26: Resource Requirements in Multiproject Environments 8 | * Copyright © Cengage Learning. All rights reserved. Project Management SoftwareA large number of concepts, tools and techniques for project management have been introduced since the 1950s, and their use has become quite widespread in recent years.Several reasons for this increase in the use of project management techniques: Globally diverse workforce Multi-project environments Availability of user-friendly software * 8 | * Copyright © Cengage Learning. All rights reserved. Success Factors in Project ManagementWhy Do Projects Fail?Project Risk ManagementWhy Do Projects Succeed? * 8 | *
  • 17. Copyright © Cengage Learning. All rights reserved. Project Risk ManagementEven with careful planning, it is not possible to anticipate everything that can put a project’s scope, schedule, or budget at risk. A careful manager develops plans for managing various risks associated with the projects.Four categories of risks: Financial Resource Risk Human Resource Risk Supply Risk Quality Risk * 8 | * Copyright © Cengage Learning. All rights reserved. Risk Assessment Plan Step 1: Identify problems (and map them). Problems are classified according to: Severity: What percentage of the project’s scope will be affected by a problem? Probability: What are the chances that a specific problem will occur? Timing: At what point in the project is the specific problem likely to appear? Dynamic risk: As the project proceeds, will the probability of the problem occurrence increase, decrease, or stay constant? *
  • 18. 8 | * Copyright © Cengage Learning. All rights reserved. Table 8.9: Project Risk Map Template * 8 | * Copyright © Cengage Learning. All rights reserved. Risk Assessment Plan continued Step 2: Analyze each potential problem. The project manager should quantify the impact of each potential problem such as time delays or cost overruns. Step 3: Once the risks are presented on the same scale, develop a prioritization scheme. Step 4: Develop a contingency plan. Done by the project team Step 5: Develop a potential upside for the project. Done by the project manager Step 6: Assign team members the responsibility for monitoring the signs of each potential problem. * 8 | * Copyright © Cengage Learning. All rights reserved.
  • 19. Risk RegisterProjects Teams will define the various risks and document these issues.Each risk will have a “potential solution.”One owner will be assigned the risk.Living document – dynamic – will change * 8 | * Copyright © Cengage Learning. All rights reserved. Why Do Projects Succeed?Clearly Defined Goals Is there a clear and written-down objective for the project? Are the main tasks structured? Has the scope of the project been agreed upon? Does the team know and agree with the goals? Are there clear milestones along the way?Project Manager Ability Is the project manager skilled and experienced? Does the project manager have a plan and a budget? Does the project manager have technical knowledge in the area of the project? Does the project manager have leadership skills? Can the project manager motivate the team? * 8 | * Copyright © Cengage Learning. All rights reserved.
  • 20. Why Do Projects Succeed?Team Member Skills Do we know what skills are required on this project? Does the team have all these skills? Is there a training program for team members? Is there a range of skills and experience on the project? Are people there because of what they bring to the project and not due to their position in the organization?Top Management Support Is there support from top management for the project? Does the project have a champion in top management? Have adequate resources been allocated to the project? Does top management have a stake in the outcome of the project? Does the project fit with organization objectives? * 8 | * Copyright © Cengage Learning. All rights reserved. Why Do Projects Succeed? Project Planning Is there a clear method for achieving the project? Has a plan for the project life been prepared from this method? Is there good short-term planning? Is progress measured against plan? Is the plan adjusted to match progress?Communication Are there clear channels of communication to all parties on the project? Can team members discuss issues openly? Can team members communicate their opinions on decisions? Do team members get feedback on performance? Do team members trust each other enough to communicate
  • 21. freely at all times? * 8 | * Copyright © Cengage Learning. All rights reserved. Why Do Projects Succeed?User Involvement Do we know the end users of the project? Have the end users been involved in setting the project outcomes? Is it easy for end users to get involved in the project? Do the end users give feedback on progress? Do the end users have ownership of the solution? Commitment of Team Are team members behind the goals of the project? Do the team members own the project outcome? Are team members involved in decision making? Can team members make suggestions about improving and changing the project? Do team members go beyond their job description for the good of the project? * 8 | * Copyright © Cengage Learning. All rights reserved. Why Do Projects Succeed?Control Systems Does the project have a control system?
  • 22. Do we check planned time and cost against actual duration and expenditure? Are checks carried out early enough to detect problems and correct them? Do we give feedback on progress to the team? Do we check that action on feedback is effective?Risk Management Have key risks on the project been identified? Has the effect of each risk been measured? Have responses been decided for key risks? Have action plans been prepared for each response? Does the team have a plan for managing unexpected risks? * Optimization and Simulation Modeling Chapter 9 9 | * Copyright © Cengage Learning. All rights reserved. Learning Objectives Formulate and solve linear programming problems. Describe the use of computer simulation modeling in operations decision making. 9 | * Copyright © Cengage Learning. All rights reserved.
  • 23. Linear Programming Helps Kellogg’s Optimize Production, Inventory, and DistributionKellogg’s must manage a highly complex production, inventory control, and distribution system.Kellogg’s employs an enterprise resource planning (ERP) system to coordinate its raw material purchases, production, distribution, and demand.The many different varieties of products and brands, packaged in many different sizes and produced at several different plants, require the use of an optimization approach known as linear programming.The innovative use of optimization techniques has allowed the company to develop a system that is estimated to save between $35 million and $40 million annually. 9 | * Copyright © Cengage Learning. All rights reserved. Discussion Starter What benefits can we receive from simulations and modeling? 9 | * Copyright © Cengage Learning. All rights reserved. Operations Research or Management ScienceOperations research or management science: the use of interdisciplinary scientific methods such as mathematical modeling, statistics, and algorithms that aid decision making for complex real-world problems of coordination and execution of the operations in an organizationThe goal is to derive the best possible solution to a problem or to optimize the performance of the organization.
  • 24. Source: © Image Source/Corbis 9 | * Copyright © Cengage Learning. All rights reserved. IntroductionMany management decisions involve making the most effective use of limited resourcesLinear programming (LP) Widely used mathematical modeling technique Planning and decision making relative to resource allocationBroader field of mathematical programming Here programming refers to modeling and solving a problem mathematically Copyright ©2015 Pearson Education, Inc. 9 | * Copyright © Cengage Learning. All rights reserved. Requirements of a Linear Programming ProblemFour properties in common Seek to maximize or minimize some quantity (the objective function) Restrictions or constraints are present Alternative courses of action are available Linear equations or inequalities Copyright ©2015 Pearson Education, Inc. 9 | * Copyright © Cengage Learning. All rights reserved. LP Properties and Assumptions TABLE 7.1 Copyright ©2015 Pearson Education, Inc.PROPERTIES OF
  • 25. LINEAR PROGRAMS1. One objective function2. One or more constraints3. Alternative courses of action4. Objective function and constraints are linear – proportionality and divisibility5. Certainty6. Divisibility7. Nonnegative variables 9 | * Copyright © Cengage Learning. All rights reserved. Formulating LP ProblemsDeveloping a mathematical model to represent the managerial problemSteps in formulating a LP problem Completely understand the managerial problem being faced Identify the objective and the constraints Define the decision variables Use the decision variables to write mathematical expressions for the objective function and the constraints 9 | * Copyright © Cengage Learning. All rights reserved. Formulating LP ProblemsCommon LP application – product mix problemTwo or more products are produced using limited resources Maximize profit based on the profit contribution per unit of each productDetermine how many units of each product to produce Copyright ©2015 Pearson Education, Inc. 9 | * Copyright © Cengage Learning. All rights reserved. Flair Furniture CompanyFlair Furniture produces inexpensive
  • 26. tables and chairsProcesses are similar, both require carpentry work and painting and varnishing Each table takes 4 hours of carpentry and 2 hours of painting and varnishing Each chair requires 3 of carpentry and 1 hour of painting and varnishing There are 240 hours of carpentry time available and 100 hours of painting and varnishing Each table yields a profit of $70 and each chair a profit of $50 Copyright ©2015 Pearson Education, Inc. 9 | * Copyright © Cengage Learning. All rights reserved. Flair Furniture CompanyThe company wants to determine the best combination of tables and chairs to produce to reach the maximum profit TABLE 7.2 Copyright ©2015 Pearson Education, Inc.HOURS REQUIRED TO PRODUCE 1 UNITDEPARTMENT(T) TABLES(C) CHAIRSAVAILABLE HOURS THIS WEEKCarpentry43240Painting and varnishing21100Profit per unit$70$50 9 | * Copyright © Cengage Learning. All rights reserved. Flair Furniture CompanyThe objective is Maximize profitThe constraints are The hours of carpentry time used cannot exceed 240 hours per week
  • 27. The hours of painting and varnishing time used cannot exceed 100 hours per weekThe decision variables are T = number of tables to be produced per week C = number of chairs to be produced per week Copyright ©2015 Pearson Education, Inc. 9 | * Copyright © Cengage Learning. All rights reserved. Flair Furniture CompanyCreate objective function in terms of T and C Maximize profit = $70T + $50CDevelop mathematical relationships for the two constraints For carpentry, total time used is (4 hours per table)(Number of tables produced) + (3 hours per chair)(Number of chairs produced) First constraint is Carpentry time used ≤ Carpentry time available 4T + 3C ≤ 240 (hours of carpentry time) Copyright ©2015 Pearson Education, Inc. 9 | * Copyright © Cengage Learning. All rights reserved. Flair Furniture CompanySimilarly Painting and varnishing time used ≤ Painting and varnishing time available 2 T + 1C ≤ 100 (hours of painting and varnishing time) This means that each table produced requires two hours of painting and varnishing time Both of these constraints restrict production capacity and affect total profit
  • 28. Copyright ©2015 Pearson Education, Inc. 9 | * Copyright © Cengage Learning. All rights reserved. Flair Furniture CompanyThe values for T and C must be nonnegative T ≥ 0 (number of tables produced is greater than or equal to 0) C ≥ 0 (number of chairs produced is greater than or equal to 0) The complete problem stated mathematically Maximize profit = $70T + $50C Copyright ©2015 Pearson Education, Inc. subject to 4T + 3C ≤240(carpentry constraint) 2T + 1C ≤100(painting and varnishing constraint) T, C ≥0(nonnegativity constraint) 9 | * Copyright © Cengage Learning. All rights reserved. Graphical Solution to an LP ProblemEasiest way to solve a small LP problems is graphicallyOnly works when there are just two decision
  • 29. variables Not possible to plot a solution for more than two variablesProvides valuable insight into how other approaches workNonnegativity constraints mean that we are always working in the first (or northeast) quadrant of a graph Copyright ©2015 Pearson Education, Inc. 9 | * Copyright © Cengage Learning. All rights reserved. Graphical Representation of Constraints This Axis Represents the Constraint T ≥ 0 This Axis Represents the Constraint C ≥ 0 FIGURE 7.1 – Quadrant Containing All Positive Values Copyright ©2015 Pearson Education, Inc. 100 – – 80 – – 60 – –
  • 30. 40 – – 20 – – C |||||||||||| 020406080100 T Number of Chairs Number of Tables 9 | * Copyright © Cengage Learning. All rights reserved. Graphical Representation of ConstraintsThe first step is to identify a set or region of feasible solutionsPlot each constraint equation on a graphGraph the equality portion of the constraint equations 4T + 3C = 240Solve for the axis intercepts and draw the line Copyright ©2015 Pearson Education, Inc. 9 | *
  • 31. Copyright © Cengage Learning. All rights reserved. Graphical Representation of ConstraintsWhen Flair produces no tables, the carpentry constraint is: 4(0) + 3C = 240 3C = 240 C = 80Similarly for no chairs: 4T + 3(0) = 240 4T = 240 T = 60 This line is shown on the following graph Copyright ©2015 Pearson Education, Inc. 9 | * Copyright © Cengage Learning. All rights reserved. Graphical Representation of Constraints (T = 0, C = 80) FIGURE 7.2 – Graph of Carpentry Constraint Equation (T = 60, C = 0)
  • 32. Copyright ©2015 Pearson Education, Inc. 100 – – 80 – – 60 – – 40 – – 20 – – C |||||||||||| 020406080100 T Number of Chairs Number of Tables 9 | * Copyright © Cengage Learning. All rights reserved. FIGURE 7.3 – Region that Satisfies the Carpentry Constraint Graphical Representation
  • 33. of ConstraintsAny point on or below the constraint plot will not violate the restrictionAny point above the plot will violate the restriction Copyright ©2015 Pearson Education, Inc. 100 – – 80 – – 60 – – 40 – – 20 – – C |||||||||||| 020406080100 T Number of Chairs Number of Tables (30, 40) (30, 20)
  • 34. (70, 40) 9 | * Copyright © Cengage Learning. All rights reserved. Graphical Representation of ConstraintsThe point (30, 40) lies on the line and exactly satisfies the constraint 4(30) + 3(40) = 240The point (30, 20) lies below the line and satisfies the constraint 4(30) + 3(20) = 180The point (70, 40) lies above the line and does not satisfy the constraint 4(70) + 3(40) = 400 Copyright ©2015 Pearson Education, Inc. 9 | * Copyright © Cengage Learning. All rights reserved. Graphical Representation
  • 35. of Constraints (T = 0, C = 100) FIGURE 7.4 – Region that Satisfies the Painting and Varnishing Constraint (T = 50, C = 0) Copyright ©2015 Pearson Education, Inc. 100 – – 80 – – 60 – – 40 – – 20 – – C |||||||||||| 020406080100 T Number of Chairs Number of Tables
  • 36. 9 | * Copyright © Cengage Learning. All rights reserved. Graphical Representation of ConstraintsTo produce tables and chairs, both departments must be usedFind a solution that satisfies both constraints simultaneouslyA new graph shows both constraint plotsThe feasible region is where all constraints are satisfied Any point inside this region is a feasible solution Any point outside the region is an infeasible solution Copyright ©2015 Pearson Education, Inc. 9 | * Copyright © Cengage Learning. All rights reserved. Graphical Representation of Constraints FIGURE 7.5 – Feasible