Correct Answer - Option 1 : CPM
Concept
Dummy Activity: An activity which is used to maintain the predefined precedence relationship only during the construction of the project network is called a dummy activity.
Estimate: An approximate calculation or judgement of value
PERT is preferred when there is some uncertainties in the methodology, availability of materials, and the final answer is not clearly known.
Whereas CPM is applied when things are almost certain
Example in case of a construction project, once the project has been finalized there is little doubt of men, material and equipment required, time etc. then PERT is used.
∴ CPM has limitations in the early stage of project.
