Introductory Certificate: The APM Project Fundamentals Qualification Study Guide by Bolton and Naybour

Author:Bolton and Naybour
Language: eng
Format: azw3
Publisher: Association for Project Management
Published: 2016-06-23T04:00:00+00:00

To move on, take a look at the next diagram. The shaded areas are the numbers we are worried about.

When you have finished adding all the way through, the last early finish box is the earliest date on which the project will finish. It is the sum of all the longer durations through the precedence diagram.

Figure 3.14 Precedence diagram showing early start and early finish calculations

Backward pass

The next job is to carry out the backward pass, Figure 3.15. Working from right to left, this time, we subtract the duration from the latest finish to arrive at the latest start. Again, there are a few tricky bits.

The latest start from the successor node gets entered into the latest finish for the predecessor node.

In the backward pass, if you have a choice about which number to take backwards from the latest start into the latest finish of the predecessor task, you always choose the lower number.

In the cases for the exam and to make life a bit easier in these examples, the earliest finish from the last node in the precedence diagram becomes the latest finish for that (last) work package node.

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