{"id":592,"date":"2025-11-22T10:45:14","date_gmt":"2025-11-22T15:45:14","guid":{"rendered":"https:\/\/www.ecahill.com\/staging\/3340\/?p=592"},"modified":"2026-01-27T19:40:52","modified_gmt":"2026-01-28T00:40:52","slug":"how-to-validate-a-software-specification","status":"publish","type":"post","link":"https:\/\/www.ecahill.com\/staging\/3340\/how-to-validate-a-software-specification\/","title":{"rendered":"How to Validate a Software Specification"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">Interview Refresher<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Are we building the right product? Software specification defines the functionality of a system and the constraints under which it must operate. Requirements validation ensures that the specification is correct, consistent, complete, feasible, verifiable, and aligned with business and user needs.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Validation is different from verification:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li class=\"\"><strong>Validation asks:<\/strong> <em>Are we building the right product?<\/em><\/li>\n\n\n\n<li class=\"\"><strong>Verification asks:<\/strong> <em>Are we building the product right?<\/em> <sup>[1]<\/sup><\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Both are essential, but validation comes first because it confirms that the defined system is actually the one stakeholders expect and that it is fit for purpose. <\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Below are the core techniques for validation of requirements of technical specifications.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>1. Reviewer Check for Errors and Inconsistencies<\/strong><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">A reviewer or team of reviewers reads through the specification to identify:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li class=\"\">Errors<\/li>\n\n\n\n<li class=\"\">Inconsistencies<\/li>\n\n\n\n<li class=\"\">Contradictions<\/li>\n\n\n\n<li class=\"\">Unclear sentences<\/li>\n\n\n\n<li class=\"\">Missing details<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">This is often the quickest way to uncover obvious issues before deeper validation activities begin.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>2. Prototyping<\/strong><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Prototyping involves building a simple working model or partial system to help customers and engineers clarify what the final system should do. It is particularly useful when requirements are unclear, complex, or high risk. Prototypes help stakeholders \u201csee\u201d the system and confirm whether the written requirements reflect their expectations.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>3. Generating Test Cases<\/strong><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">A powerful technique is to generate test cases directly from the specification. If a requirement <strong>cannot<\/strong> be tested then it is not written clearly enough.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Test case generation helps identify:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li class=\"\">Ambiguous or vague requirements<\/li>\n\n\n\n<li class=\"\">Missing conditions<\/li>\n\n\n\n<li class=\"\">Contradictory behaviours<\/li>\n\n\n\n<li class=\"\">Requirements that are not verifiable<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">This technique links validation to quality assurance.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>4. Validity Checks<\/strong><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Validity checks ensure that the requirements genuinely reflect business or stakeholder needs. A specification may be formally correct yet still include requirements that do not contribute to the real objectives of the system. During validity checks, we ask:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li class=\"\">Does this requirement belong in the system?<\/li>\n\n\n\n<li class=\"\">Does it support a real user or business need?<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>5. Consistency Checks<\/strong><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Consistency checks ensure that requirements do not contradict each other.<br>Examples include:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li class=\"\">Conflicting business rules.<\/li>\n\n\n\n<li class=\"\">Two requirements defining different behaviours for the same scenario.<\/li>\n\n\n\n<li class=\"\">Contradictions between functional and non-functional constraints.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">A consistent specification avoids logical conflicts that could derail design or testing later.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>6. Completeness Checks<\/strong><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Completeness checks ensure that nothing important is missing from the specification.<br>This includes verifying that:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li class=\"\">All inputs and outputs are defined<\/li>\n\n\n\n<li class=\"\">All scenarios, constraints, and user types are considered<\/li>\n\n\n\n<li class=\"\">There are no \u201cTBD\u201d or \u201cto be confirmed\u201d placeholders<\/li>\n\n\n\n<li class=\"\">Non-functional requirements (performance, reliability, response time) are fully stated<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Incomplete specifications are one of the main causes of project delays and rework.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>7. Verifiability<\/strong><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">A verifiable requirement can be tested. If a requirement cannot be verified, it cannot be validated during testing or acceptance.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Example of <strong>non-verifiable<\/strong> requirement:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">&#8220;The system should respond quickly.\u201d This must be rewritten using measurable criteria. <\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>8. Realistic or Feasible Requirements<\/strong><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Feasibility checks ensure the requirement can realistically be implemented. This includes checking:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li class=\"\">Technical feasibility.<\/li>\n\n\n\n<li class=\"\">Cost and budget constraints.<\/li>\n\n\n\n<li class=\"\">Timeline constraints.<\/li>\n\n\n\n<li class=\"\">Existing system limitations.<\/li>\n\n\n\n<li class=\"\">Available skills and technologies.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">A requirement that cannot be achieved in practice is not a valid requirement.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Summary<\/strong><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">By checking for validity, consistency, completeness, verifiability, and feasibility, errors and omissions can be identified early in the software development life cycle (SDLC) to improve overall project outcomes. If you need to  perform  detailed and thorough work there is an IEEE Standard, &#8220;<strong>IEEE Standard for System, Software, and Hardware Verification and Validation<\/strong>&#8221; <sup>[2]<\/sup><\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Footnotes<\/strong><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\"><sup>[1]<\/sup>Ian Sommerville, <em>Software Engineering<\/em>, 10th edition, Pearson, 2016, p. 14.<br>&lt;<sup>[2]<\/sup> IEEE Standard 1012-2024, <em>Standard for System, Software, and Hardware Verification and Validation<\/em>. Available at: <a href=\"https:\/\/ieeexplore.ieee.org\/document\/11134780\">https:\/\/ieeexplore.ieee.org\/document\/11134780<\/a>.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n","protected":false},"excerpt":{"rendered":"<p>An interview refresher on validating software specifications, covering key techniques such as reviewer checks, prototyping, test cases, and feasibility assessments. <\/p>\n","protected":false},"author":1,"featured_media":598,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"nf_dc_page":"","_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_feature_clip_id":0,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":true,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2},"jetpack_post_was_ever_published":false},"categories":[1,4],"tags":[32,40,20,43],"class_list":["post-592","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-software-development","category-testing","tag-ai","tag-software-architecture","tag-software-engineering","tag-technical-interviews"],"jetpack_publicize_connections":[],"jetpack_shortlink":"https:\/\/wp.me\/p4aJd0-9y","jetpack_sharing_enabled":true,"jetpack_featured_media_url":"https:\/\/i0.wp.com\/www.ecahill.com\/staging\/3340\/wp-content\/uploads\/2025\/11\/Spec.jpg?fit=385%2C508&ssl=1","_links":{"self":[{"href":"https:\/\/www.ecahill.com\/staging\/3340\/wp-json\/wp\/v2\/posts\/592","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.ecahill.com\/staging\/3340\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.ecahill.com\/staging\/3340\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.ecahill.com\/staging\/3340\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.ecahill.com\/staging\/3340\/wp-json\/wp\/v2\/comments?post=592"}],"version-history":[{"count":8,"href":"https:\/\/www.ecahill.com\/staging\/3340\/wp-json\/wp\/v2\/posts\/592\/revisions"}],"predecessor-version":[{"id":690,"href":"https:\/\/www.ecahill.com\/staging\/3340\/wp-json\/wp\/v2\/posts\/592\/revisions\/690"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.ecahill.com\/staging\/3340\/wp-json\/wp\/v2\/media\/598"}],"wp:attachment":[{"href":"https:\/\/www.ecahill.com\/staging\/3340\/wp-json\/wp\/v2\/media?parent=592"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.ecahill.com\/staging\/3340\/wp-json\/wp\/v2\/categories?post=592"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.ecahill.com\/staging\/3340\/wp-json\/wp\/v2\/tags?post=592"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}