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Operations Management: An Integrated Approach, 5th Edition by Nada R. Sanders, R. Dan Reid

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Formula Review

  1. Expected time for each activity:

    images

  2. Variance for each activity:

    images

  3. Calculating the z value to estimate probability of completion:

    images

Solved Problems (See student companion site for Excel template.)

Problem 1

Use the following information to diagram the project network.

Activity Immediate Predecessors
A none
B A
C A
D B
E C
F D, E
G F

Diagram the network using AON notation.

Solution

The AON notation is straightforward for this project. Activity A is done first, then activities B and C can begin. When B is done, activity D begins. When C is done, activity E begins. Activity F begins after both D and E are finished. Figure 16-16 shows the diagrammed network.

FIGURE 16-16 Project network diagram

images

• Problem 2

Your boss gives you the following information about the new project you are leading. The information includes the activities, the three time estimates, and the precedence relationships.

(a) Calculate the expected time for each of the activities.

(b) Determine the expected completion time of the project.

(c) Calculate the variance of each of the project ...

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