What are the disadvantages of critical path analysis, Project Management

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What are the disadvantages of critical path analysis?

Disadvantages of critical path analysis (CPA):

a. Supposes a trade off among time and money but most staff cost could be a certain not variable cost

b. The complexity of the demonstration will increase as additional activities are comprised

c. Key uncertainties frequently exist while estimating the duration for activities, thus can be a poor prediction for elapsed time.

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