The document discusses the concept of crashing, which refers to reducing the duration of an activity by increasing its cost. It provides that the crash cost (Cc) and normal cost (Cn) increase as the crash time (Tc) decreases compared to the normal time (Tn). For example, reducing an activity's normal duration of 8 weeks by 1 week would increase the cost from the normal $9k to the crashed cost of $12k, and reducing it by 2 weeks would increase the cost to $15k.

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