INF3708 EXAM STUDY NOTES.

INF3708 EXAM STUDY NOTES. PERT network diagram PERT (Program Evaluation Review Technique) network diagram is used to model a project’s activities and their relationships as a network. It was developed to take account of the uncertainty surrounding estimates of task durations. The difference between the CPM and the PERT methods is that the CPM uses a single estimate for the duration of each task, whereas the PERT method uses 3 estimates. These 3 estimates include Optimistic (a) Most likely (m) Pessimistic (b) These 3 estimates are combined to calculate the te values using the following formula After the te values are calculated, the standard deviation ( s ) can be calculated using the following formula The next step is to calculate the z -value using the following formula Exam notes 3 PERT event labelling convention CPM diagram ( activity on arrow ) CPM labelling Example on how to do Draw a CPM network for the list of tasks in the table above to illustrate the interaction of activities Exam notes 4 Identify the critical path and its duration after carefully considering the problem again the project team decides that an alternative to the original plan would be to extend the duration of activity C to four weeks. This would allow activity E to drop to three weeks. Identify what the resulting critical activities are. Do these changes affect the total duration of the project?