Chapter 4 – Test Analysis & Design
Modified Condition/Decision Coverage (MC/DC) – ISTQB Definition
Last Updated: July 12, 2026 · SoftwareTestPilot QA Team
Official ISTQB Definition
The percentage of all single condition outcomes that independently affect a decision outcome that have been exercised by a test case suite.
In simple words
For each atomic condition, show one test where flipping just that condition flips the whole decision.
Exam tip
MC/DC is mandated by DO-178C level A for safety-critical avionics software.
Related terms
- Multiple Condition TestingCover every combination of true/false values of the sub-conditions inside a compound decision.
- Condition CoveragePercent of individual boolean sub-conditions that have been evaluated true and false.
- Decision CoveragePercent of decision outcomes (true/false) hit by your tests.
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