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The Basics - Critical Path Analysis (CPA)

Critical Path Analysis (CPA)
 
The method of demonstrating a scheme/project using a network and exploiting it to recognise the most effective means of accomplishing it is called critical path analysis.
 
Aims:
 
  • To be able to form an activity network from a precedence table (including the use of dummy activities, dummies, if necessary).
  • To use a forward and backward pass to find the earliest and latest times of an event.
  • To be able to find the critical path in an activity network.
  • To calculate the total float of an activity.
  • To construct charts to allow us to schedule activities.
 
An activity is a job or process that forms part of an overall project.  An activity that begins at event i and finishes at event j is referred to as activity (i, j).  They are represented by arcs on a precedence network.  The nodes represent events, i.e. the beginning/end of activities.

 
Activities may not have identical start and end nodes:
Picture
This is NOT allowed
Picture
It should be represented like this
​You have unique start and finish nodes.
Picture

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