Define "Critical path", "Slack time", "Resource Levelling" and "Dummy activity" with reference to PERT and CPM. An architect has been awarded a contract to prepare plans for an urban renewal project.

Define "Critical path", "Slack time", "Resource Levelling" and "Dummy activity" with reference to PERT and CPM.

An architect has been awarded a contract to prepare plans for an urban renewal project. The job consists of the following activities and their estimated value. Draw a critical path arrow diagram for this project, indicate the critical path and calculate the total slack and free slack for each activity. information attached in file