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Engineers who test safety critical software are often confronted with a test coverage metric called MCDC. In this video, you will learn what is MCDC, why is MCDC used, and what can I do if my requirements based test cases do not achieve full MCDC. First, what is MCDC? MCDC, which stands for Modified Condition Decision Coverage, is a structural coverage metric. Structural coverage analysis measures how much of your design has been tested. Two common forms of structural coverage are decision and condition coverage. MCDC extends decision and condition coverage by requiring that each condition should independently affect the decision outcome. In other words, MCDC shows how a given input independently affects the output of a logical expression. Here is a simple example to explain the concept. This model has an or gate, and gate, and a switch with three Boolean inputs A, B, and C and integer output Y. To achieve full MCDC, we need to develop test factors that ensure that each of the inputs i
