Requirements Validation, Review, Prototyping, and Test Case Generation

Requirements Validation

Requirements validation is the process of ensuring that specified requirements satisfy customer needs, focusing on identifying problems early to avoid costly rework later.

Late discovery of requirement issues can lead to high rework costs, as changes to requirements often require redesign, implementation, and retesting, which are more expensive than fixing design or code errors.

During validation, various checks are performed: validity (alignment with stakeholder needs), consistency (no conflicts), completeness (all requirements and constraints covered), feasibility (realizable within technology, budget, schedule), and testability (requirements can be verified by tests).

Requirements Review

The customer team and developers read the requirement documents, investigate errors, inconsistencies, conflicts, and ambiguities, and then negotiate with the customer to resolve identified issues.

Prototyping

Prototyping, as a non‑independent software process method, is used within a complete methodology to validate requirements, especially when they are unclear; an executable model is shown to customers and end‑users to confirm it meets their needs.

Iterative prototyping reduces cost by providing a clear, understandable, and consistent set of requirements.

Test Case Generation

Requirements must be testable; incorporating testability into validation often reveals requirement problems. Difficult or impossible test design indicates a requirement may be unimplementable and should be reconsidered.

The term “test” here does not mean writing and running code for each function; it means describing inputs, expected values, and steps to verify each feature.

A test case template is provided (image).

Proving that a set of requirements truly satisfies user needs is difficult because users must imagine how the system fits into their workflow, making further requirement changes inevitable.