Exam 9: Project Scheduling: Pertcpm

A project network is shown below. Use a forward and a backward pass to determine the critical path, and then fill out the table below. Activity times are in weeks. Now assume that the times listed are only the expected times instead of being fixed times. Is the probability of being finished in more than 28 weeks more or less than 50%?

Activities K, M and S immediately follow activity H, and their latest start times are 14, 18, and 11. The latest finish time for activity H

Consider the following PERT/CPM network with estimated times in weeks. The project is scheduled to begin on May 1. The three-time estimate approach was used to calculate the expected times and the following table gives the variance for each activity: ​ a. Give the expected project completion date and the critical path. b. By what date are you 99% sure the project will be completed?

The latest finish time for an activity is the largest of the latest start times for all activities that immediately follow the activity.

From this schedule of activities, draw the PERT/CPM network.

When activity times are uncertain, an activity's most likely time is the same as its expected time.

Arcs in a project network indicate

Activities following a node

All activities on a critical path have zero slack time.

For an activity with more than one immediate predecessor activity, which of the following is used to compute its earliest finish (EF) time?

When activity times are uncertain, total project time is normally distributed with mean equal to the sum of the means of all of the critical activities.

Slack equals

For an activity with more than one immediate successor activity, its latest-finish time is equal to the

To determine how to crash activity times

Which is not a significant challenge of project scheduling?

​Precedence relationships among activities is critical in CPM analysis but not in PERT.

​A critical activity is

It is possible to have more than one critical path at a time.

The critical path for this network is A - E - F and the project completion time is 22 weeks. ​ If a deadline of 17 weeks is imposed, give the linear programming model for the crashing decision.

A cookie recipe gives the following numbered steps. 1.Preheat oven. 2.Grease cookie sheets. 3.Cream shortening and sugar. 4.Add eggs and flavoring. 5.Measure and sift dry ingredients. 6.Add dry ingredients to mixture. 7.Drop by spoonfuls onto sheets and bake for 10 minutes. Although the steps are numbered, they do not always reflect immediate precedence relationships. Develop a table that lists the immediate predecessors for each activity.