Efficiently calculate the number of invalid state transitions to test in a 4-state diagram. Perfect for ISTQB CTAL-TA exam prep. Clear explanation of the state transition test technique.
Table of Contents
Question
Applying the State Transition test technique to the State Transition diagram above, how many invalid transitions are there to test?
A. 5
B. 10
C. 15
D. 20
Answer
B. 10
Explanation
The image shows a state transition diagram with 4 states: MENU, SCREEN 1, SCREEN 2, and SCREEN 3. The diagram shows the valid transitions between these states.
To determine the number of invalid transitions to test, I’ll identify all possible transitions, then subtract the number of valid transitions shown.
Possible transitions between 4 states: 4 x 3 = 12
Self-transitions (staying in same state): 4
Total possible transitions: 12 + 4 = 16
Valid transitions shown in diagram: 6
Therefore, the number of invalid transitions is:
16 total possible – 6 valid = 10 invalid transitions
So the correct answer is B. 10
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