Project networks (CPM/PERT): In network terminology, the actual performance or work content required to complete a task is called what?
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AAn event
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BAn activity
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CA duration
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DNone of these
Answer
Correct Answer: An activity
Explanation
Introduction / Context:CPM/PERT networks represent projects as connected elements. Distinguishing between activities, events, and durations is foundational to do forward/backward passes, compute floats, and identify the critical path.
Given Data / Assumptions:
- Activity-on-Arrow or Activity-on-Node conventions may be used.
- Every task consumes time and possibly resources, regardless of representation.
Concept / Approach:An activity is the performance of work that takes time and resources. An event (milestone) is a point in time indicating the start or finish of activities. Duration is the measured time an activity takes, not the work itself.
Step-by-Step Solution:
Identify the task (e.g., machine setup, pour concrete, test module).Represent it as an activity (arrow or node).Associate a duration with the activity based on estimates or data.Define start/finish events (AOA) or predecessor/successor links (AON).Verification / Alternative check:Check glossary in project management standards: “activity” explicitly denotes the work to be performed.
Why Other Options Are Wrong:
- Event: a zero-duration point signifying completion or start, not the work itself.
- Duration: the length of time, not the task.
- None of these: incorrect because activity is the correct term.
Common Pitfalls:Calling milestones “activities”; forgetting that dummy activities in AOA have zero duration and carry logic only.
Final Answer:An activity