What is included in a control chart?

Question

Options

• ABaseline
• BPlanned value
• CUpper specification limit
• DExpenditure

• A
  4% (1)
• B
  4% (1)
• C
  81% (22)
• D
  11% (3)

Explanation

A control chart is a quality management tool used to monitor process stability over time, and it includes specification limits - the upper and lower boundaries that define acceptable performance as required by customers or stakeholders. The Upper Specification Limit (USL) marks the maximum allowable value, making C correct.

Why the distractors are wrong:

• A (Baseline): Baselines belong to project scope, schedule, and cost management - they track planned vs. actual project performance, not process variation.
• B (Planned Value): Planned Value is an Earned Value Management (EVM) metric used to measure schedule performance, unrelated to control charts.
• D (Expenditure): Expenditure is a financial/cost concept with no role in statistical process control tools like control charts.

Memory tip: Think of a control chart as having two sets of limits - control limits (what your process can do, derived from data) and specification limits (what the customer wants, like the USL). If your process exceeds the Upper Specification Limit, the product is out of spec - and that's always on the chart.

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