Group Assignment 6 - Crashing

IDS312 Team Assignment




Using the network below and the additional information provided find:

(a) The crash cost per day per activity.

(b) Which activities should be crashed to meet a project deadline of 10
days at minimum cost.

(c) What is the new cost of the project




A6 D5


Sta FINIS H
B3
C6




Normal Time Normal Cost Crash Cost Crash Time
Activity (days) (total) (total) (days)
A 6 $ 300 $ 500 2
B 3 250 325 1
C 6 400 550 4
D 5 150 225 2




Critical Path: B-C-D = 14days
While A-D = 11days


a) The crash cost per day per activity.

A = (500-300)/(6-2) = $50
B = (325-250)/(3-1)= $37.5
C = (550-400)/(6-4)= $75
D = (225-150)/(5-2)= $25

b) Which activities should be crashed to meet a project deadline of 10 days
at minimum cost.

For critical path B-C-D, the cheapest should be crashed first. D is the
cheapest.
Reduce D by 1 day for B-C-D to equal 13 days for additional cost of $25.




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