What is it?
Critical path method (CPM) is a technique for analysing the work to be done on a project into identifiable tasks at an early stage.
When to use it
CPM can be used on any project (large or small) which has a definable beginning and end and involves the performance of a number of distinct but interrelated tasks, according to a logical sequence of work flow.
What does it achieve?
CPM enables alternative courses of action to be examined both initially and while a project is under way. As a result communications are improved, trouble-spots are highlighted for special attention at the right time, and effort is concentrated on the time critical tasks.
Key steps
Stage 1
- List activities
- Note constraints
- Draw network
Stage 2
- Add time estimates for activities
- Calculate float, critical path, etc.
Stage 3
- Agree Network and target dates
- Modify network if necessary
- Distribute networks or issue data
Stage 4
- Monitor progress
- Initiate remedial action as necessary.
Typical Critical Path Network diagram
