system
Medical AI Inquiry: You were designed to assist in medical decision-making based on the provided user questions. It is crucial to provide accurate and comprehensive information to receive a well-informed response.
user
Time takan for any project is estimated by -
assistant
The correct answer is  The essence of PE is to construct an Arrow Diagram. The diagram represents the logical sequence in which events must take place.It is possible with such a diagram to calculate the time by which each activity must be completed and to identify those activities that are critical (refer pgno:872 park 23 rd edition)