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Activity Network Diagram

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Questions and Answers

What is the main objective of PERT analysis in project management?

To calculate the critical path of a project
To evaluate the three time estimates of an activity (correct)
To determine the earliest start time of a project
To identify the dependencies between project activities

Which of the following is a characteristic of the Critical Path Method (CPM)?

It assumes that activity times are independent
It is used for projects with limited resources
It focuses on the critical activities in a project (correct)
It considers both optimistic and pessimistic time estimates

What is the formula to calculate the expected time estimate of an activity in PERT analysis?

te = to + tp
te = (to + tm + tp) / 2
te = (to + 4tm + tp) / 3 (correct)
te = (to + tp) / 2

Which activity has the highest expected time estimate in the given project?

Activity F (A) Signup and view all the answers

What is the purpose of creating a network diagram in project management?

To determine the dependencies between project activities (B) Signup and view all the answers

Which of the following is a limitation of the CPM method?

It does not consider the uncertainty of activity times (B) Signup and view all the answers

What is the difference between the PERT and CPM methods?

PERT considers uncertainty, while CPM does not (B) Signup and view all the answers

Which activity has the lowest expected time estimate in the given project?

Activity I (C) Signup and view all the answers

What is the purpose of estimating activity times in project management?

To determine the project schedule (C) Signup and view all the answers

Which of the following is a benefit of using the PERT method?

All of the above (D) Signup and view all the answers

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Study Notes

Time Estimates

Three time estimates are used to calculate the time estimate (te) for each activity: optimistic time estimate (to), most likely time estimate (tm), and pessimistic time estimate (tp).

Formula for Time Estimate (te)

te = to + 4tm + tp

Calculated Time Estimates

Activity A: te = 2 + 4(5) + 8 = 24 -> te = 6
Activity B: te = 2 + 4(3) + 4 = 30 -> te = 5
Activity C: te = 6 + 4(8) + 10 = 72 -> te = 12
Activity D: te = 2 + 4(4) + 6 = 30 -> te = 5
Activity E: te = 2 + 4(6) + 10 = 66 -> te = 11
Activity F: te = 6 + 4(7) + 8 = 54 -> te = 9
Activity G: te = 6 + 4(8) + 10 = 90 -> te = 15

Network Diagram

The network diagram for the project is constructed using the calculated time estimates.

Time Estimates for Each Activity

Activity A: te = 4
Activity B: te = 6
Activity C: te = 10
Activity D: te = 12
Activity E: te = 9
Activity F: te = 21
Activity G: te = 22
Activity H: te = 5
Activity I: te = 3

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