CPM (Critical Path Method) characteristics: which statements correctly describe CPM network analysis in construction project planning?
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AEmphasis is given to activities (deterministic durations)
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BUncertainties in activity time are not allowed (deterministic model)
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CActivities are represented by arrows (AOA representation)
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DStart/end of activities are denoted by nodes (events)
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EAll of the above
Answer
Correct Answer: All of the above
Explanation
Introduction / Context:CPM, or Critical Path Method, is a deterministic scheduling technique widely used in construction and infrastructure projects. It identifies the sequence of activities that determines the minimum project duration and highlights where schedule flexibility exists.
Given Data / Assumptions:
- Classical CPM uses deterministic activity durations.
- Network representation may be AOA (Activity-on-Arrow), where activities are arrows and nodes are events.
- Modern tools also support AON (Activity-on-Node), but the question targets the classical view.
Concept / Approach:
CPM focuses on activities with known durations, calculates earliest and latest event times, and derives total float and free float. The “critical path” consists of zero-float activities that govern overall project duration.
Step-by-Step Solution:
Recognize CPM is deterministic: uncertainties are not modeled.In AOA CPM, activities are arrows; nodes mark the beginning/end (events).Therefore all listed statements align with classical CPM.Verification / Alternative check:
Standard scheduling texts differentiate CPM (deterministic, activity focus) from PERT (probabilistic). Both can be represented in AOA; the item specifically mirrors AOA CPM.
Why Other Options Are Wrong:
Any single statement alone is incomplete; only “All of the above” fully characterizes CPM per the question.
Common Pitfalls:
Confusing CPM with PERT; assuming CPM always uses AON (software may, but theory embraces both representations).
Final Answer:
All of the above