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How do you validate and verify requirements in waterfall development?

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Requirements gathering is a crucial phase in any software development project, especially in the waterfall model. Waterfall development is a linear and sequential approach, where each stage depends on the completion and approval of the previous one. Therefore, it is essential to validate and verify the requirements before moving to the next stage, to avoid costly rework, delays, and errors. In this article, we will explain how to validate and verify requirements in waterfall development, and what tools and techniques you can use to ensure quality and alignment with the stakeholders' needs and expectations.

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1 Validation vs Verification

Validation and verification are two related but distinct concepts in requirements engineering. Validation is the process of checking whether the requirements are correct, complete, consistent, and relevant for the problem domain and the stakeholders' goals. Verification is the process of checking whether the requirements are well-defined, clear, unambiguous, testable, and traceable. Validation answers the question "Are we building the right product?", while verification answers the question "Are we building the product right?".

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Angela Wick

| 2 Million+ Trained | Helping BAs Navigate AI | BA-Cube.com Founder & Host | LinkedIn Learning Instructor
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Verifying requirements is about the quality of the requirements, are they understandable and usable to the various audiences that use them? Validating requirements is about making sure they are aligned with a business need.

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2 Validation Techniques

In order to validate requirements in waterfall development, there are several techniques that can be employed. Reviews involve inspecting the requirements documents with stakeholders, experts, or peers to identify any gaps, errors, or inconsistencies. These reviews can be formal or informal, depending on the level of rigor and documentation required. Prototypes are another option; these involve creating a mock-up or simplified version of the product or system to demonstrate its main features and functions and receive feedback from stakeholders. Prototypes can be low-fidelity or high-fidelity, depending on the level of detail and realism needed. Finally, scenarios involve creating realistic and representative examples of how the product or system will be used to illustrate the requirements and validate their feasibility and usability. Scenarios can be written, graphical, or interactive, depending on the level of interaction and visualization required.

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Vivek (C.P.) Krishnan CFA, PMP

Lead Associate Software Development at Fannie Mae
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Need to also at this time start to understand the data being talked about - many a time the following scenarios impact "requirements" gathered. -- Volume of data being processed - (leads to different set of non-functional requirements) -- Data field values encountered ==> leads to different other requirements - to handle incorrect / missing data --> increases the things that the software must handle - to address data concerns. -- Validation requirements - from the above - increases testing scope.

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Sandeep Gouri

Director / SR. PROJECT MANAGER – ORACLE HCM CLOUD / HRMS / HRIS / HR SYSTEMS / PEOPLE SOFT / WORKDAY / SUCCESSFACTORS / HCM
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There are various ways to validate , one can create use cases , various test scenarios , mapping with the requirements.The more deeper the scenarios are the better the validations are .

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3 Verification Techniques

Verifying requirements in waterfall development can be aided by several techniques, such as creating models to express requirements in a more precise and formal way and evaluate their logic and consistency. Tests can be created to measure and evaluate requirements, and metrics can be used to measure the quality and performance of the requirements. Models can be textual, mathematical, or diagrammatic; tests can be functional or non-functional; metrics can be based on size, complexity, completeness, clarity, ambiguity, or other attributes. All of these techniques help check compliance and alignment with standards and criteria.

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4 Tools for Validation and Verification

Various tools can support you in validating and verifying the requirements in waterfall development. Document management tools can help you create, store, organize, and share the requirements documents, as well as track changes, versions, and approvals. Requirements management tools can assist in defining, prioritizing, tracing, testing, or validating them. Modeling tools enable creating and visualizing models of the requirements with diagrams, charts, or graphs. Testing tools help create and execute tests of the requirements such as test cases, plans, or scripts. They also automate, monitor, and report the test results to ensure coverage and quality.

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Sandeep Gouri

Director / SR. PROJECT MANAGER – ORACLE HCM CLOUD / HRMS / HRIS / HR SYSTEMS / PEOPLE SOFT / WORKDAY / SUCCESSFACTORS / HCM
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The best approach is to leverage the document management tools which enables the validation technique easier. The more you leverage the tools the better the overall monitoring .

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5 Here’s what else to consider

This is a space to share examples, stories, or insights that don’t fit into any of the previous sections. What else would you like to add?

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Sandeep Gouri

Director / SR. PROJECT MANAGER – ORACLE HCM CLOUD / HRMS / HRIS / HR SYSTEMS / PEOPLE SOFT / WORKDAY / SUCCESSFACTORS / HCM
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Ensure proper Analysis , Review , Design and Testing is done . Proper Test Cases with Validation approach . Proper Testing methodologies, Mapping of User requirements , proper use cases , tracking of KPI's.

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How do you validate and verify requirements in waterfall development?

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1 Validation vs Verification

2 Validation Techniques

3 Verification Techniques

4 Tools for Validation and Verification

5 Here’s what else to consider

Requirements Gathering

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