The official definition of MCDC, Modified Condition/Decision Coverage) is Every POINT of ENTRY and exit in the program has been invoked at least once, every condition in a decision in the program has taken on all possible outcomes at least once, and each condition has been shown to affect that decision outcome independently. A condition is shown to affect a decisions outcome independently by varying just that decision while holding fixed all other possible CONDITIONS.

The key to successful, and accurate, MCDC testing is to analyze each sourcecode construct for potential MCDC applicability and then develop sufficient test cases to ensure that each condition in that construct is independently verified per the aforementioned MC/DC definition. Today, most MC/DC testing is DONE with the assistance of DO-178B qualified structural coverage tools, particularly MCDC tools.

The official definition of MCDC, Modified Condition/Decision Coverage) is Every point of entry and exit in the program has been invoked at least once, every condition in a decision in the program has taken on all possible outcomes at least once, and each condition has been shown to affect that decision outcome independently. A condition is shown to affect a decisions outcome independently by varying just that decision while holding fixed all other possible conditions.

The key to successful, and accurate, MCDC testing is to analyze each sourcecode construct for potential MCDC applicability and then develop sufficient test cases to ensure that each condition in that construct is independently verified per the aforementioned MC/DC definition. Today, most MC/DC testing is done with the assistance of DO-178B qualified structural coverage tools, particularly MCDC tools.