PK0-005 Tools and Documentation Practice Question
A project manager notices that a task is taking longer than planned and the project is falling behind schedule. The project manager wants to identify the root cause of the delay. Which quality tool would be most appropriate?
⚠ Common exam trap
Many candidates confuse a Pareto chart (which ranks causes by frequency) with root cause analysis, but the Pareto chart only shows what is most common, not the underlying cause-effect relationships that the cause-and-effect diagram explicitly maps.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Cause-and-effect diagram
The cause-and-effect diagram (also known as a fishbone or Ishikawa diagram) is the most appropriate quality tool for identifying the root cause of a delay because it systematically maps potential causes (e.g., resources, processes, environment) to the observed effect (the schedule delay). Unlike other tools that show data distribution or trends, this diagram is designed for root cause analysis by visually brainstorming and categorizing contributing factors.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Histogram
Why it's wrong here
A histogram displays the frequency distribution of numerical data, showing spread and shape rather than causal relationships. It is tempting because it visualises variation in measurements such as task durations, and would be correct when analysing how consistently a process performs across a dataset.
- ✗
Control chart
Why it's wrong here
A control chart tracks process stability and variation over time against limits, so it flags that a delay occurred but cannot trace its origin. It is tempting because it detects out-of-control performance, and would be correct when monitoring whether a process remains within acceptable statistical bounds.
- ✓
Cause-and-effect diagram
Why this is correct
A cause-and-effect diagram maps a problem back to its underlying root causes across categories such as people, process and materials. It directly satisfies the stem's need to identify why the task is delayed, unlike tools that merely display or track variation.
- ✗
Pareto chart
Why it's wrong here
A Pareto chart ranks causes by frequency to highlight the vital few, but it requires cause data already categorised, which the manager lacks. It is tempting because it prioritises problems, and would be correct once identified causes need ordering by impact for corrective effort.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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