Requirement Validation

Requirement Validation is the process of confirming, before significant development effort is invested, that a stated requirement accurately captures a genuine need and would, if built exactly as written, actually satisfy that need. It addresses a different question from verifying a completed increment against its acceptance criteria: validation asks whether the requirement itself is the right thing to build, examined early while correction is still cheap, rather than asking whether a finished product correctly implements a requirement that may or may not have been the right one in the first place.

Validation Versus Verification

Verification Asks Whether It Was Built Correctly

Verification, typically performed through testing and scope validation after an increment is built, checks whether the delivered work matches its stated acceptance criteria.

Validation Asks Whether It Is the Right Requirement

Requirement Validation instead checks the requirement itself, before or during early development, asking whether satisfying it as written would actually address the underlying need it claims to serve.

Why Both Are Necessary

A requirement can be verified successfully — built exactly as specified — while still failing validation, if the specification itself was based on a misunderstanding of the real need; catching this earlier through validation prevents wasted effort delivering the wrong thing precisely.

Approaches to Validating a Requirement

Reviewing with the Original Requester

Walking a stakeholder through the written requirement and confirming, in their own words, that it reflects what they actually meant surfaces misunderstandings introduced during initial capture or elaboration.

Testing Against Realistic Scenarios

Working through specific, concrete scenarios the requirement is meant to cover often reveals gaps between the stated requirement and the actual need, particularly for edge cases the original request may not have anticipated.

Prototyping or Mockups

For requirements involving significant ambiguity, building a lightweight prototype or mockup and reviewing it with stakeholders before full development validates the requirement's interpretation at low cost.

Cross-Referencing Related Requirements

Checking a requirement against others addressing related functionality can reveal inconsistencies suggesting one or both requirements have drifted from the actual underlying need.

When Validation Should Occur

During Refinement

The most natural point for validation is during backlog refinement, when a requirement is being elaborated in detail and stakeholders are actively engaged in clarifying its intent.

Before Committing Significant Effort

For large or high-risk requirements, an additional, more deliberate validation step before formal planning commitment reduces the chance of discovering a fundamental misunderstanding only after substantial work has begun.

Continuously as New Information Arrives

Because understanding of a need can evolve even after a requirement is initially validated, teams remain open to revisiting validation if new information suggests the original interpretation may need revision.

Visualizing Validation Within the Requirement Lifecycle

Validation acts as an earlier checkpoint focused on the requirement's own correctness, positioned before development begins, distinct from verification which occurs afterward to confirm the built increment matches that same requirement.

Common Pitfalls

Skipping Validation for Seemingly Obvious Requirements

Assuming a requirement is self-evidently correct because it seems straightforward can miss subtle misunderstandings that only surface through explicit confirmation with the original requester.

Confusing Validation with Verification

Treating the two as interchangeable can leave a team confident that an increment matches its written requirement while remaining unaware the requirement itself never reflected the actual need.

Validating Too Late

Deferring validation until after significant development has occurred defeats its purpose, since the value of validation lies in catching misunderstandings while correction remains inexpensive.

Benefits of Rigorous Requirement Validation

Reduced Wasted Development Effort

Catching a misunderstood requirement before development begins avoids investing effort in building something that, however well executed, does not serve the real need.

Higher Confidence in Delivered Value

Requirements confirmed to reflect genuine stakeholder need, before being built, are more likely to produce outcomes that satisfy users once delivered.

Stronger Stakeholder Trust

Actively involving stakeholders in confirming that requirements reflect their actual intent demonstrates a commitment to delivering genuine value rather than merely completing tasks as literally written.