Determine the Cost per Unit of Time (Assume Days) to Expedite each Activity:

The relationship between activity time and cost may be shown graphically by plotting CC and CT coordinates and associating them to the NC and NT coordinates by a concave, convex, or straight line or some other form, based on the actual cost structure of activity performance, as in Figure. For activity A we assume a linear relationship between time and cost. This supposition is common in practice and helps us derive the cost per day to expedite because this value can be found directly by taking the slope of the line using the formula Slope = (CC - NC)/(NT - CT). The calculations needed to obtain the cost of expediting the remaining activities are shown in Table.

Table: Determination of Cost per Day to Crash Each Activity

Compute the Critical Path

For the simple network we have been utilizing. This schedule will take 10 days. The critical path is referring to A-B-D.