Exam 3: Project Management

A network consists of the following list. Times are given in weeks. Activity Preceding Duration A -- 9 B A 2 C A 12 D A 5 E B 6 F B 8 G C, F 3 H D 2 I H 8 J G, I 6 K E, J 2 a. Draw the network diagram. b. Which activities form the critical path? c. How much slack exists at activities A and F? d. What is the duration of the critical path?

What are some of the ethical issues faced by project managers? Which of these are likely to occur before a project begins, which are likely to occur while the project is underway, and which may occur after a project is complete? Illustrate any one of these from recent news.

PERT, but not CPM, has the ability to consider the precedence relationships in a project.

The critical path for the network activities shown below is __________ with duration __________. Activity Duration Immediate Predecessors A 4 -- B 2 A C 7 -- D 4 A E 5 B,C,D

Three critical path activities are candidates for crashing on a CPM network. Activity details are in the table below. Activity Normal Time Normal Cost Crash Duration Crash Cost 8 days \ 6,000 6 days \ 8,000 3 days \ 1,800 2 days \ 2,400 12 days \ 5,000 9 days \ 7,700 a. What is the crash cost per unit time for each of the three activities? b. Which activity should be crashed first to cut one day from the project's duration; how much is added to project cost? c. Which activity should be the next activity crashed to cut a second day from the project's duration; how much is added to project cost?

The critical path for the network activities shown below is __________ with duration __________. Activity Duration Immediate Predecessors A 10 -- B 8 -- C 2 D 4 E 5 ,,

A PERT project has 45 activities, 19 of which are on the critical path. The estimated time for the critical path is 120 days. The sum of all activity variances is 64, while the sum of variances along the critical path is 36. The probability that the project can be completed between days 108 and 120 is

A simple CPM network has five activities, A, B, C, D, and E. A is an immediate predecessor of C and of D. B is also an immediate predecessor of C and of D. C and D are both immediate predecessors of E.

Which of the following is not one of the three phases of project management?

Activity R on a CPM network has predecessors M and N, and has successor S. R has duration 5. N's late finish is 18, while M's is 20. S's late start is 14. Which of the following is definitely true?

A project whose critical path has an estimated time of 820 days with a variance of 225 has a 20% chance that the project will be completed before day (rounded to nearest day).

The standard deviation of project duration is the average of the standard deviation of all activities on the critical path.

Which of the following projects were completed by Bechtel?

A project organization

Which of the following statements regarding PERT times is true?

A project being analyzed by PERT has 38 activities, 16 of which are on the critical path. If the estimated time along the critical path is 90 days with a project variance of 25, the probability that the project will be completed in 88 days or less is

If an activity whose normal duration is 13 days can be shortened to 10 days for an added cost of $1,500, the crash cost per period is

Pirmin's Bike Shop is behind on a custom bike and needs to crash 8 hours of time from the 8-step project. Given the project table below calculate the crash cost for 8 hours of time-savings. Suppose Pirmin calls the customer and asks for a project extension, reducing the amount of time he needs to crash. Calculate both the maximum time-savings available on a $25 crash budget and the cost to crash four hours of savings. $\begin{array}{|c|c|c|c|c|c|}\hline\text { Activity } & \begin{array}{c}\text { Normal } \\\text { Duration } \\\text { (hours) }\end{array} & \begin{array}{c}\text { Nomal } \\\text { Cost }(\$)\end{array} & \begin{array}{c}\text { Crash } \\\text { Duration } \\\text { (hours) }\end{array} & \begin{array}{c}\text { Crash } \\\text { Cost (S) }\end{array} & \begin{array}{c}\text { Immediate } \\\text { Predecessors }\end{array} \\\hline \mathrm{A} & 2 & 10 & 2 & 0 & \text { None } \\\hline \mathrm{B} & 3 & 15 & 2 & 23 & \mathrm{~A} \\\hline \mathrm{C} & 5 & 25 & 4 & 30 & \mathrm{~B} \\\hline \mathrm{D} & 3 & 20 & 1 & 24 & \mathrm{C} \\\hline \mathrm{E} & 6 & 30 & 4 & 45 & \mathrm{C} \\\hline \mathrm{F} & 1 & 5 & 1 & 0 & \mathrm{C}, \mathrm{E} \\\hline \mathrm{G} & 7 & 35 & 6 & 50 & \mathrm{~F} \\\hline \mathrm{H} & 10 & 50 & 7 & 80 & \mathrm{D}, \mathrm{G} \\\hline\end{array}$

Slack is the amount of time an activity can be delayed without delaying the entire project.

The critical path for the network activities shown below is __________ with duration __________. Activity Duration Immediate Predecessors A 2 -- B 4 -- C 6 A,B D 1 A,B E 2 B,C,D