A project manager wants to visualize task dependencies and the critical path for a construction project. Which tool should they use?
A network diagram maps tasks as nodes with arrows showing dependencies, making the longest sequence — the critical path — visible. That directly satisfies the stem's requirement to visualise both task dependencies and the critical path for the construction project.
Why this answer
A network diagram (also called a PERT or precedence diagram) is the standard project management tool for visualizing task dependencies and identifying the critical path, because it explicitly shows the sequence of activities, their dependencies, and the longest path through the network. It is the only tool in the list designed specifically for dependency and critical-path analysis.
Exam trap
The trap is confusing Gantt charts with network diagrams — Gantt charts show schedule over time, but only network diagrams explicitly model dependencies and the critical path, which is what the question asks for.
How to eliminate wrong answers
Option A is wrong because a burndown chart tracks remaining work versus time in Agile sprints — it shows progress velocity, not task dependencies or critical path. Option C is wrong because a Gantt chart shows tasks as horizontal bars against a calendar timeline; while it can display dependencies with arrows, it is not the primary tool for critical-path analysis and does not inherently highlight the critical path. Option D is wrong because a milestone chart only marks key dates or deliverables and shows no dependencies or sequencing between tasks.