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Why is it important that equivalence partitions are mutually exclusive and collectively exhaustive?

hard📝 Conceptual Q10 of 15
Testing Fundamentals - Functional Testing Techniques
Why is it important that equivalence partitions are mutually exclusive and collectively exhaustive?
ATo reduce the number of test cases by ignoring some inputs
BTo allow overlapping test cases for better coverage
CTo ensure every input belongs to one and only one partition for complete testing
DTo focus testing only on valid inputs
Step-by-Step Solution
Solution:

  1. Step 1: Understand mutual exclusivity

    Partitions must not overlap so each input belongs to only one partition.

  2. Step 2: Understand collective exhaustiveness

    Partitions must cover all possible inputs to avoid missing any test cases.

  3. Final Answer:

    To ensure every input belongs to one and only one partition for complete testing -> Option C

  4. Quick Check:

    Partitions must be exclusive and exhaustive for full coverage [OK]
Quick Trick: Partitions cover all inputs without overlap [OK]
Common Mistakes:
  • Allowing overlapping partitions
  • Missing some input values
  • Testing only valid inputs

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