Control Chart
A control chart is a statistical graph used to monitor process stability by tracking measurements over time against defined control limits.
“A statistical process control tool used to monitor a process and determine whether it is statistically controlled. It graphically depicts the average value and the upper and lower control limits (the highest and lowest values) of a process.”
(Definition reproduced from the ISTQB Glossary. Copyright belongs to ISTQB.)
View the complete ISTQB GlossaryWhat is Control Chart?
Control charts help teams determine whether variations are caused by normal process behavior or indicate unusual events requiring investigation.
Process monitoring: Measurements are plotted in chronological order.
Control limits: Upper and lower limits help identify abnormal variation.
Continuous improvement: Stable processes are easier to predict and improve.
Real World Example
A regulated product team is preparing a release where Control chart appears in reviews, test design conversations, or defect triage rather than as an isolated glossary word.
The risk is that the team treats Control chart as interchangeable with nearby ISTQB terms. That makes test scope blurry and can lead to weak evidence for the release decision.
The tester anchors the discussion in the official definition, asks where the concept appears in the product, and designs examples that show the difference between Control chart and similar ideas.
The page becomes useful in practice because Control chart is connected to a specific testing decision, not memorized as a detached definition.
Practice Questions
Question 1
Which statement BEST describes Control chart in the context of ISTQB terminology?
Question 2
A tester needs to explain Control chart to a non‑technical stakeholder. Which approach is MOST appropriate?
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