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Planning and Control in General
• What is planning and control?
• What is difference between planning and
control?
• How does the nature of demand affect planning
and control?
• What is involved in planning and control?
Concepts We need to Understand
• dependent demand and independent demand
• make-to-stock, make-to-order, resource-to-
order
• loading, sequencing, scheduling and monitoring
• pull and push systems
Planning and Control
– Reconcile Supply and Demand
Supply of
products
and services
Planning
and Control
Demand for
products and
services
Operation
resources
Required time,
quantity and
quality of products
and services
Customer
requirements
Planning is deciding
Control is
what activities should take place in
the operation and their quantities
when they should take place
what resources should be allocated
to them
understanding what is actually
happening in the the operation
deciding whether there is a
significant deviation from what
should be happening
(if there is deviation) changing
resources in order to affect the
operation’s activities
Planning and Control
Significance of planning or control
Timehorizon
Hours/daysDays/weeks/monthsMonths/years
Medium-term Planning and Control
Uses partially dissaggregated demand
forecasts
Determines resources and contingencies
Objectives set in both financial and
operations terms
Long-term Planning and Control
Uses aggregated demand forecasts
Determines resources in aggregated form
Objectives set in largely financial terms
Short-term Planning and Control
Uses totally dissaggregated forecasts or
actual demand
Makes interventions to resources to
correct deviations from plans
Ad hoc consideration of operations
objectives
PLANNING
CONTROL
Planning and control needs….
Information on Demand levels
Information on Resources
Dependent and Independent Demand
Dependent demand
e.g. input tyre store in car plant
Demand for tyres is
governed by the number of
cars planned to be made
Demand for tyres is
largely governed by
random factors
ACE
TYRES
Independent demand
e.g. tyre fitting service
Dependent and Independent Demand
-defining them
Demand = forecasts + known orders
• Dependent demand – the demand is mainly
coming from known orders.
• Independent demand – the demand is mainly
coming from forecasted figures.
P and D for the Different Types of Planning and Control
Purchase Make Deliver
D
P
Purchase Make Deliver
Purchase Make Deliver
D
P
Make to stock
Make to order
Resource
to order
P
D
Where D is demand time and P is total throughput time.
MAKE TO STOCK
Purchase
And … – ‘make-to-stock and assemble-to-order’
Planning and Control
Make Parts Assemble Deliver
D
P
Order
ASSEMBLE TO ORDER
Resource-to-order
Make-to-order
Make-to-stock
Dependent
Demand
Independent Demand
Each product or
service large
compared with
total capacity of
each operation
Each product or
service small
compared with
total capacity of
each operation
Planning and Control Activities
Sequencing
MonitoringScheduling
Loading
Are activities
going to plan?
When to do
things?
In what order
to do things?
How much
to do?
Loading
– the amount of work allocated in terms of time
Maximum time available
Normal time available Not worked
Planned time available
Planned running time Set-ups
Available time
Actual running time
Down
time
Sequencing
– the order in which the work will be tackled
Various sequencing rules are used in operations:
- Customer priority;
- Due date;
- LIFO - last in first out;
- FIFO - first in first out;
Longest operation time first;
- Shortest operation time first.
-
Scheduling
– the details on starts and finishes of jobs
Gantt Chart
• Created by American industrial engineer Henry
Gantt (1861-1919)
• In a table format
• Two dimensions-jobs (tasks) and time
• the horizontal axis is directly proportional to time
• Easy to draw and use for a day-to-day plan
JOB
Mon
6th
Tue
7th
Wed
8th
Thur
9th
Fri
10th
Mon
13th
Tue
14th
Table
Shelves
Kitchen
units
Bed
Time now
Scheduled
activity time Actual progress
Gantt Chart for Job Progress
JOB
Mon
6th
Tue
7th
Wed
8th
Thur
9th
Fri
10th
Mon
13th
Tue
14th
Wood
preparation
Assembly
Finishing
Paint
Time now
Scheduled
activity time
Actual progress
T
B
B T
S K
S S S
K
KTS
B T
Gantt Chart for Work Centers
Non- productive time
Pull and Push Control
CENTRAL OPS. PLANNING AND CONTROL SYSTEM
Work
centre
DEMANDWork
centre
Work
centre
Work
centre
Instruction on
what to make
and where to
send it
FORECAST
PULL CONTROL
Work
centre
Work
centre
Work
centre
Work
centre DEMAND
Request Request Request Request
Delivery Delivery Delivery Delivery
PUSH CONTROL
KNOWN
ORDERS
True or False
If the demand of a product is mainly from forecasts,
we call this type of demand independent demand.
Resource-to-order planning and control is used for
dealing with independent demand.
Time is the only important aspect in planning and
control activities
Summary
• The three dimensions of planning and control are:
timing, quantity (volumes) and quality
• The difference between dependent and independent
demand is the % of known orders or forecasts of the
total demand
• Types of planning and control are:
‘make-to-stock’, ‘make-to-order’, ‘resource-to-
order’, ‘make-to-stock and assemble- to-order’
• Planning and control activities are:
loading, sequencing, scheduling and monitoring

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Planing and control in general 1

  • 1. Planning and Control in General • What is planning and control? • What is difference between planning and control? • How does the nature of demand affect planning and control? • What is involved in planning and control?
  • 2. Concepts We need to Understand • dependent demand and independent demand • make-to-stock, make-to-order, resource-to- order • loading, sequencing, scheduling and monitoring • pull and push systems
  • 3. Planning and Control – Reconcile Supply and Demand Supply of products and services Planning and Control Demand for products and services Operation resources Required time, quantity and quality of products and services Customer requirements
  • 4. Planning is deciding Control is what activities should take place in the operation and their quantities when they should take place what resources should be allocated to them understanding what is actually happening in the the operation deciding whether there is a significant deviation from what should be happening (if there is deviation) changing resources in order to affect the operation’s activities Planning and Control
  • 5. Significance of planning or control Timehorizon Hours/daysDays/weeks/monthsMonths/years Medium-term Planning and Control Uses partially dissaggregated demand forecasts Determines resources and contingencies Objectives set in both financial and operations terms Long-term Planning and Control Uses aggregated demand forecasts Determines resources in aggregated form Objectives set in largely financial terms Short-term Planning and Control Uses totally dissaggregated forecasts or actual demand Makes interventions to resources to correct deviations from plans Ad hoc consideration of operations objectives PLANNING CONTROL
  • 6. Planning and control needs…. Information on Demand levels Information on Resources
  • 7. Dependent and Independent Demand Dependent demand e.g. input tyre store in car plant Demand for tyres is governed by the number of cars planned to be made Demand for tyres is largely governed by random factors ACE TYRES Independent demand e.g. tyre fitting service
  • 8. Dependent and Independent Demand -defining them Demand = forecasts + known orders • Dependent demand – the demand is mainly coming from known orders. • Independent demand – the demand is mainly coming from forecasted figures.
  • 9. P and D for the Different Types of Planning and Control Purchase Make Deliver D P Purchase Make Deliver Purchase Make Deliver D P Make to stock Make to order Resource to order P D Where D is demand time and P is total throughput time.
  • 10. MAKE TO STOCK Purchase And … – ‘make-to-stock and assemble-to-order’ Planning and Control Make Parts Assemble Deliver D P Order ASSEMBLE TO ORDER
  • 11. Resource-to-order Make-to-order Make-to-stock Dependent Demand Independent Demand Each product or service large compared with total capacity of each operation Each product or service small compared with total capacity of each operation
  • 12. Planning and Control Activities Sequencing MonitoringScheduling Loading Are activities going to plan? When to do things? In what order to do things? How much to do?
  • 13. Loading – the amount of work allocated in terms of time Maximum time available Normal time available Not worked Planned time available Planned running time Set-ups Available time Actual running time Down time
  • 14. Sequencing – the order in which the work will be tackled Various sequencing rules are used in operations: - Customer priority; - Due date; - LIFO - last in first out; - FIFO - first in first out; Longest operation time first; - Shortest operation time first. -
  • 15. Scheduling – the details on starts and finishes of jobs Gantt Chart • Created by American industrial engineer Henry Gantt (1861-1919) • In a table format • Two dimensions-jobs (tasks) and time • the horizontal axis is directly proportional to time • Easy to draw and use for a day-to-day plan
  • 18. Pull and Push Control CENTRAL OPS. PLANNING AND CONTROL SYSTEM Work centre DEMANDWork centre Work centre Work centre Instruction on what to make and where to send it FORECAST PULL CONTROL Work centre Work centre Work centre Work centre DEMAND Request Request Request Request Delivery Delivery Delivery Delivery PUSH CONTROL KNOWN ORDERS
  • 19. True or False If the demand of a product is mainly from forecasts, we call this type of demand independent demand. Resource-to-order planning and control is used for dealing with independent demand. Time is the only important aspect in planning and control activities
  • 20. Summary • The three dimensions of planning and control are: timing, quantity (volumes) and quality • The difference between dependent and independent demand is the % of known orders or forecasts of the total demand • Types of planning and control are: ‘make-to-stock’, ‘make-to-order’, ‘resource-to- order’, ‘make-to-stock and assemble- to-order’ • Planning and control activities are: loading, sequencing, scheduling and monitoring