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Under which conditions are Gantt charts most helpful?
AMany tasks, task times in hours, and long complex routes
BFew tasks, long task times, and short simple job routes
CMany tasks whose dependencies must all be displayed
DTasks whose durations are completely unknown in advance
Answer & Solution
Correct answer: B. Few tasks, long task times, and short simple job routes
1. A Gantt chart is a bar graph, so it can only carry a limited amount of information legibly.
2. It is most helpful when only a few tasks are involved.
3. It works best when task times are relatively long, meaning days or weeks rather than hours.
4. It also suits jobs whose routes are short and simple.
5. Option C fails because a Gantt chart does not show how tasks are related, which is one of its main shortcomings.
6. Option D fails because unknown durations call for PERT, which handles uncertainty with three time estimates.
_Source: OpenStax Introduction to Business (CC BY 4.0), Ch 10 "Achieving World-Class Operations Management", section Tracking Progress with Gantt Charts_
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