Which statement correctly differentiates effort from duration?

Question

BlackTom AI · Accepted Answer

Effort is the total amount of labor required to complete a task (measured in person-hours or person-days), while duration is the elapsed calendar time from start to finish (measured in hours, days, or weeks), so the correct answer is the first option.

1) Relevant knowledge points and concepts
- Effort (also called work) = total labor required, typically in person-hours or person-days.
- Duration = calendar or elapsed time from task start to finish.
- Relationship: Effort = Duration × Number of assigned resources (when resources are constant and working full-time). Equivalently, Duration = Effort / (effective resource capacity).
- Units: effort (person-hours), duration (calendar days/weeks).

2) Complete reasoning process (step by step)
- Define a task with Effort E = 40 person-hours.
- If one person works 8 hours/day, Duration D = 40 / 8 = 5 days.
- If two people (each 8 hours/day) are assigned, D = 40 / (2×8) = 40 / 16 = 2.5 days.
- These calculations show effort (40 person-hours) stays constant; duration changes with resource allocation.

3) Intermediate calculation steps shown
- E = 40 person-hours.
- Single resource daily capacity = 8 hours → D = E / 8 = 40 / 8 = 5 days.
- Two resources capacity = 16 hours/day → D = E / 16 = 40 / 16 = 2.5 days.

4) Why the correct answer is correct
- The first option states effort = total labor hours and duration = calendar time based on resource availability. This matches standard project-management definitions and the mathematical relationship E = D × R.

5) Why other options are incorrect
- Option 2 reverses definitions (claims effort is calendar time) — incorrect.
- Option 3 claims they measure the same thing — incorrect; they are related but distinct quantities with different units.
- Option 4 claims effort decreases when more people are added and duration stays constant — incorrect: adding people usually shortens duration, not effort; effort is the total work and does not automatically decrease when staffing changes (and may even increase due to coordination overhead).

6) Conclusion
The provided answer ("Effort is the total labor hours required, while duration is the calendar time needed to complete the work based on resource availability.") is correct and matches the standard definitions and the calculations above.

Which statement correctly differentiates effort from duration?单项选择题

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