How did you apply test design techniques at the requirements stage?

At the requirements gathering and analysis stage, techniques of test design help identify potential scenarios and cases that need to be tested even before development begins. For example:

• Equivalence partitioning — dividing input data into equivalence classes to cover different options without redundancy.
• Boundary value analysis — testing system behavior at data range boundaries.
• Decision tables — for complex logical conditions, to consider all combinations.

Applying these techniques at the requirements stage allows:

• To identify incompleteness or ambiguity in requirements.
• To form a clear set of test cases covering main scenarios.
• To reduce the risk of missing important checks.

For example, when testing a user age form, you can immediately determine boundary values (0, 1, 17, 18, 100) and equivalence classes (negative numbers, acceptable age, too large age), which helps to form tests even before implementation.