Science behind scheduling
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Science behind scheduling



This presentation talks about the scientific approach one should adopt while creating a project schedule. I used some references from PMI and PMBOX.

This presentation talks about the scientific approach one should adopt while creating a project schedule. I used some references from PMI and PMBOX.



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Science behind scheduling Presentation Transcript

  • 1. Wise Talk Thursdays
  • 2. • Science Behind SchedulingTopic • One HourPlanned Duration • Open Type of Interaction • Management Sciences Area of Knowledge
  • 3. Definition •Brief History and Evaluation of Scheduling •What is Scheduling Explanation •Definition of related terms •The Process of Schedule Development Example •Practical
  • 4. The concept of Scheduling is not new; Sun Tzu wrote about scheduling and strategy about 5000 years ago from a military prospective Pyramids in Egypt (3000 years ago approx), Transcontinental railways (200 years) ago; None of these could have been accomplished without some sort of scheduling i.e., understanding of activities and sequencing.
  • 5. Henry L Gantt An American engineer and social scientist invented a bar chart which we know as Gantt Chart - 1917 Kelley and Walker invented CPM -1956-57 The Pert Project invented the name “Critical Path” and everyone else borrowed it -1957 In 1968 PERT and CPM emerged as a standard nomenclatures Dr. Fondhal invented a non- computerized methodology for scheduling which is being used by every scheduling computer package today (Precedence Diagramming Method -1977 ) The Science of Scheduling as defined by Critical Path Analysis “CPA” celebrated its 50th Anniversary in 2007.
  • 6.  The term Schedule means  Arrange or plan (an event) to take place at a particular time.  Make arrangements for (someone or something) to do something.
  • 7.  Work Breakdown Structure  Work Package  Decomposition  Rolling Wave Planning  Schedule Compression ◦ Crashing ◦ Fast Tracking
  • 8.  Resource Leveling  Bottom-up Estimating  Project Network Diagram  PERT (Program Evaluation and Review Technique)
  • 9.  According to Project Management Institute, The Following is the process from Start to End in order to create a Project Schedule  Activity Definition  Activity Sequencing  Activity Resource Estimating  Activity Duration Estimating  Schedule Development  Schedule Control
  • 10.  Activity Definition is a process of defining the Activities which are part of scope of work in order to complete the Project  We drive the following things after Activity Definition process ◦ Activity List ◦ Activity Attributes ◦ Milestone List
  • 11.  For Activity Sequencing , different Techniques can be used which are ◦ Precedence Diagramming Method (AON) ◦ Activities can have four types of dependencies under this method which are  Finish to Start  Start to Start  Start to Finish  Finish to Finish
  • 12. ◦ Arrow Diagramming Method ◦ Activities can have one type of dependency under this method which is  Finish to Start
  • 13.  Durations in Project Network Diagram are calculated by using the following  Early Start  Early Finish  Late Start  Late Finish  Forward Pass Calculation  Backward Pass Calculation
  • 14.  Activity Resource Estimation is a process where the resources (physical, human, infrastructure) are determined  Top down or  Bottom up  Estimation
  • 15.  Activity Duration Estimation is a process where the duration against each Activity is calculated.  Following Techniques can be used to calculated Duration for activity ◦ Analogous Estimating ◦ Parametric Estimating ◦ Three Point Estimate or PERT Estimate  Reserve Analysis
  • 16.  PERT Estimation uses the following concept
  • 17. ◦ Following are some methods to develop the Project Schedule ◦ Project Network Diagram Method ◦ Critical Path Method, longest path in project network diagram ◦ Critical Chain Method , adjusted schedule after incorporating dead lines and resources constraints in critical path method
  • 18.  Suppose we have a project with Following Activities  Start  Requirement Analysis -TASK 1 – 3 Days  Development - TASK 2 – 10 Days  Installation - TASK 3 - 6 Days  Deployment - TASK 4 - 8 Days  UAT - TASK 5 - 4 Days  Close
  • 19.  Second Step would be to find the dependencies among activities and draw a network diagram  Lets say we have only Finish to Start Relationship between activities as under  Start-TASK 1-TASK 2- TASK 5-End  Start –TASK 1-TASK3-TASK4-TASK5-End
  • 20.  Let us Calculate Early Start and Early Finish of Theses Tasks by Forward Pass.