Why are test design techniques needed?

Test design techniques are needed for systematic and efficient creation of test cases. They help:

• Ensure coverage of all important scenarios and requirements.
• Find errors and defects early.
• Reduce duplication and redundancy of tests.
• Improve the quality and reliability of the software product.

For example, techniques like equivalence partitioning or boundary value analysis allow identifying the minimal set of tests that most effectively verify functionality.