Pert,cpm

2. Concept of crashing

3. Concept of crashing
 Cc and Cn are the crash and normal costs,
respectively,
 Tc and Tn are the crash and normal times for the
activity.
 The cost slope is how much it would cost to speed up
or slow down the activity.

4. Concept of crashing explained
 Thus, for each week the activity duration is
reduced from the normal time of 8 weeks, the
cost will increase by $3K. Completing the
activity 1 week earlier (from 8 weeks to 7
weeks) would alter the cost from the normal
cost of $9K to the “sped up” cost of $9K + $3K
= $12K
 completing it another week sooner (in 6
weeks) would increase the cost to $12K + $3K
= $15K