1. MGMT E-5050
Scott Corey CPAs
Project Crashing
Homework Solution

2. Scott Corey CPAs The Scott Corey accounting firm is installing a new
computer system. Several things must be done to
make sure the system works properly before all the
accounts are put into the new system.
The following table provides information about this
project:

3. Immediate Predecessor
Scott Corey CPAs
Activity
Immediate Predecessor
Time ( Weeks ) A - 3 B 4 C 6 D 2 E 5 F G
D,E H
F,G

4. Scott Corey CPAs REQUIREMENT:
How long will it take to install the system?
What is the critical path?

5. Scott Corey CPAs The managing partner of the firm has decided that the
system must be up and running in 16 weeks.
Consequently, information about crashing the project
was put together and is shown in the following table:

6. Scott Corey CPAs Activity Immediate Predecessor Normal Time ( weeks )
Crash
Cost
( $ ) A - 3 2
8,000
9,800 B 4
9,000
10,000 C 6
12,000
15,000 D 1
15,500 E 5
5,000
8,700 F
7,500 G
D,E
9,400 H
F,G
6,600

7. Scott Corey CPAs REQUIREMENT:
If the project is to be finished in 16 weeks, which
activity or activities should be crashed to do this
at the least additional cost?
What is the total cost of this?
List all the paths in this network. After the crash-
ing has been done, what is the time required for
each path?

8. Scott Corey CPAs REQUIREMENTS:
If the project completion time must be reduced
another week so that the total time is 15 weeks,
which activity or activities should be crashed?
Solve this by inspection.
NOTE: It is sometimes better to crash an activity
that is not the least cost for crashing if it
is on several paths rather than to crash
several activities on separate paths when
there is more than one critical path.

9. Homework Solution The total time to complete the project is 17 weeks.
The critical path is A-E-G-H
Crash activity “G” one week at an additional cost
of $700.00
The paths are A-E-G-H, A-C-F-H, and B-D-G-H.
When “G” is crashed by 1 week, the project
completion time is reduced to 16 weeks.