What is test design and why do testers need it?

Test design is the process of developing test cases and scenarios based on analysis of requirements, specifications, and other artifacts. The goal of test design is to ensure maximum coverage of functionality and to identify defects with minimal costs.

Why it is needed by testers:

• Helps systematize testing, avoiding misses of important scenarios.
• Allows creating effective and reproducible tests.
• Provides a balance between completeness and testing costs.
• Simplifies communication with the development team and analysts.

Examples of test design techniques:

• Equivalence partitioning
• Boundary value analysis
• Decision tables
• Scenario testing

Using test design improves testing quality and helps identify errors early.