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ISTQB CTAL-TA: How Many Invalid State Transitions Are There to Test in This Diagram?

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?

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

ISTQB CTAL-TA certification exam assessment practice question and answer (Q&A) dump including multiple choice questions (MCQ) and objective type questions, with detail explanation and reference available free, helpful to pass the ISTQB CTAL-TA exam and earn ISTQB CTAL-TA certification.