Creating critical paths

Scheduling resources can create new critical paths. IX*laying the start of an activity because of lack of resources will cause that activity to become critical if this uses up its float. Furthermore, a delay in completing one activity can delay the availability of a resource required for a later activity. If the later one is already critical then the earlier one might now have been made critical by linking their resources.

Amanda's revised schedule, w hich still calls for four analyst-designers but only for a single day. is illustrated in the solution to Exercise 8.2 (check it in the back of the book if you have not done so already). Notice that in rescheduling some of the activities she has introduced additional critical activities. Delaying the specification of module C has used up all of its float - and that of the subsequent activities along that path! Amanda now has two critical paths - the one shown on the precedence network and the new one.

In a large project, resource-linked criticalitics can be quite complex - a hint of the potential problems may be appreciated by looking at the next exercise.

Exercise 8.3 Amanda decides to delay the specification of module C for a further day to ensure that only three analyst-designers will be required. The relevant part of her revised bar chart and resource histogram are shown in figure 8.6. Which activities will now be critical?

Week number

Specify overall system

Schedule Total lloat

moduli Check specifications Q

Check specification C[

I I I Design module A I I Design module B[

Design module C|

Design module D

Week number

Figure 8.6 Amanda's project scheduled to require three analyst-designers.

Week number

Figure 8.6 Amanda's project scheduled to require three analyst-designers.

Project Management Made Easy

Project Management Made Easy

What you need to know about… Project Management Made Easy! Project management consists of more than just a large building project and can encompass small projects as well. No matter what the size of your project, you need to have some sort of project management. How you manage your project has everything to do with its outcome.

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