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ISTQB Certified Tester Advanced Level: Test Analyst (CTAL-TA) · ISTQB
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MENU Valid: Start → SCREEN 1 (1) Invalid: Back, Next, Complete, Refresh (4) SCREEN 1 Valid: Refresh (self), Next → SCREEN 2, Back → MENU (3) Invalid: Start, Complete (2) SCREEN 2 Valid: Refresh (self), Next → SCREEN 3, Back → SCREEN 1 (3) Invalid: Start, Complete (2) SCREEN 3 Valid: Refresh (self), Back → SCREEN 2, Complete → MENU (3) Invalid: Start, Next (2) => Total invalid transitions = 10
In my opinion there 6 invalid transitions according to the formula: N - number of states NumberOfInvalidTransitions = N^2 - NumberOfValidTransitions = 16 - 10 - 6