Project Crashing Assignment

Consider the following project represented by the table of activities and

predecessors. Illustrate how this project can be crashed stagewise. What is

the minimum time and cost for the crashed project?

Activity Predecessors Time Required Cost

Normal Crash Normal Crash

A - 4 2 10,000 14,000

B A 6 5 30,000 34,500

C A 2 1 8,000 9,500

D B 2 1 12,000 18,000

E B, C 7 5 40,000 52,000

F D, E 6 3 20,000 29,000

Hint:

1) Calculate the critical path and find the critical activities.

2) Apply the rule for choosing activities for crashing (the one with the least

cost slope which is also a critical activity). Crash this activity, i.e., reduce

its duration, calculate the new project completion time and cost of

crashing this stage.

3) For the next stage, continue with crashing with the next available

candidate. (Check if the critical path has changed because of crashing).

4) Indicate the crashed activity, crashed duration, and the stepwise and

the cumulative cost of the crashing in each stage.

In addition, you may assume partial crashing, i.e., reducing an activity's duration

by less than the maximum crashing amount, is permitted for all activities.