Critical path analysis

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Critical path analysis

  1. 1. Planning & schedulingmore complex projects
  2. 2.  helps to schedule and manage complex projects developed to control large defense projects help to plan all tasks that must be completed helps to see where remedial actions needs to be taken helps to identify the minimum length of time needed to complete a project helps to identify which project steps should be accelerated to complete the project at time
  3. 3.  you cannot start some activities until others are finished (sequential activities) other activities are not dependent on completion of any other task (parallel tasks)
  4. 4.  Step 1: List all activities in the plan ◦ For each activity show:  The earliest start date  Estimated length of time it will take  Whether it is parallel or sequential  For sequential tasks, show which stage they depend on
  5. 5.  Step 2: Plot the activities as a circle and arrow diagrams ◦ Cicles show events within the project, such as start and finish of tasks  The number shown in the left hand half allows to identify each one easily ◦ An arrow running between two circles shows the activity needed to complete that task  A task description is written underneath the arrow  The length of the task is shown above it
  6. 6.  You may find that you need to complete a project earlier than your CPA says is possible You need to re-plan the project
  7. 7.  A variation on CPA that takes a slightly more skeptical view of time estimates made for each project stage Time to use for each stage:T=(shortest time+4*likely time+ longest time)/6 This helps to bias time estimates away from the unrealistically short time-scales normally assumed
  8. 8.  What tasks must be carried out. Where parallel activity can be performed. The shortest time in which you can complete a project. Resources needed to execute a project. The sequence of activities, scheduling and timings involved. Task priorities. The most efficient way of shortening time on urgent projects.

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