Question 10.

a: Determine critical path, total time and slack.

b: Rank critical path activities in order of lowest crashing cost and determine number of days each can be crashed.

c: Shorten the project one day at a time. Check after esch reduction to see what path is critical. Show the crashing sequence.

Here is a clearer picture.

The cost/week ratio is directly taken from how it is presented in the text book. I think they want to treat the week as worth 7 days.

374 Chapter 8. Scheduling 11 10. A project is shown below, and the project manager is Askarto develop animal time.cost autor Estimated Crash Cost Week Duration Time for Days) Days) Crash Activity ID Predecessor A 10 3 5500 C 4 70 E 2 1 5330 a. Determine the critkal path total time and black b. Ranis the critical path activities in order of lowest Crashing cost, and determine the number of day each can be crashed. c. Sharlen the project one day at a lime, and check aller each seduction law path is critical. Show the crashing quence Note: Another pathw y th where wi th and at hun is usik. Thiyius rulin, Class Discussions 3 1. Project scheduling using solate is iften a time CONSERT PRO and one should avoid this as much Assible 2. Promet scheduling is pood only foc lange projects 374 Chapter 8 Scheduling 10. A project is shown below, and the project manager is asked to develop an optimal time-cost solution: Estimated Crash Cost/Week Duration Time for Activity ID Predecessor (Days) (Days) Crash A 10 5 8 4 5500 $300 $700 B, D 97 E 2 1 F 5800 a. Determine the critical path, total time, and slack. b. Rank the critical path activities in order of lowest crashing cost, and determine the number of days each can be crashed. c. Shorten the project one day at a time, and check after each reduction to see what path is critical. Show the crashing sequence. Note: Another path may equal the length of the shortened critical path and no additional improvement is feasible. This is the optimum time-cost solution Class Discussions 1. Project scheduling using software is often a time- consuming process, and one should avoid this as much as possible