Calculating the Backward Path

Now let's calculate the backward path. The very first question that arises is: "What is the date for the latest finish?" The backward path is calculated with the latest finish dates and all we have at this point is the earliest finish date. The answer is that if there is no final reserve task in the network, the latest finish date of the final milestone is taken to be the same as the earliest finish date calculated in the forward path. Having established a starting point for the backward path calculation, we then invoke the following equation:

Latest start = Latest finish - Duration

In calculating backward through the finish-to-start network, we use the earliest of the "latest start" dates of a successor task as the latest finish for a predecessor task. Figure 7-6 shows these calculations for our example network.

7 11 11 13

Figure 7-6: Backward Path Calculation.

7 11 11 13

Figure 7-6: Backward Path Calculation.

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