Exam 13: Project Scheduling: Pertcpm

Consider a project that has been modeled as follows: a.Draw the PERT/CPM network for this project and determine project's expected completion time and its critical path. b.Can activities E and G be performed simultaneously without delaying the minimum project completion time? c.Can one person perform A,G,and I without delaying the project? d.By how much can activities G and L be delayed without delaying the entire project? e.How much would the project be delayed if activity G was delayed by 7 hours and activity L was delayed by 4 hours? Explain.

The critical path

Arcs in a project network indicate

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.

In deciding which activities to crash,one must

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

To determine how to crash activity times

When activity times are uncertain,

PERT and CPM

The earliest finish time for the final activity is the project duration.

A critical activity can be part of a noncritical path.

The length of time an activity can be delayed without affecting the project completion time is the slack.

Activities G,P,and R are the immediate predecessors for activity W.If the earliest finish times for the three are 12,15,and 10,then the earliest start time for W

Which of the following is always true about a critical activity?

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?

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

Which of the following is a general rule for crashing activities?

The earliest start time for an activity is equal to the smallest of the earliest finish times for all its immediate predecessors.

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

Crashing refers to an unanticipated delay in a critical path activity that causes the total time to exceed its limit.