Notes on requirements engineering and business analysis, written while working things out, shared publicly.https://gytisgurklys.eu/enhttps://gytisgurklys.eu/en/posts/widely-adopted-rarely-tested-use-cases-and-user-stories/https://gytisgurklys.eu/en/posts/widely-adopted-rarely-tested-use-cases-and-user-stories/A re-analysis of two systematic mappings, 237 studies in total, asking whether the adoption of use cases and user stories rests on evidence that they work. One study tests a technique against a baseline in which it is absent; it was published in 2002.Sun, 23 Aug 2026 07:00:00 GMThttps://gytisgurklys.eu/en/posts/why-traceability-fails-by-construction/https://gytisgurklys.eu/en/posts/why-traceability-fails-by-construction/A requirements system carries four statement kinds with incompatible lifecycles: norm, change, state and verification. Whenever one artefact carries two of them, a specific traceability failure follows, predictable from the pair alone.Sat, 22 Aug 2026 07:00:00 GMThttps://gytisgurklys.eu/en/posts/business-rule-language-standard/https://gytisgurklys.eu/en/posts/business-rule-language-standard/A controlled English for rules, based on SBVR and RuleSpeak: a necessity test that decides what is a rule at all, a closed keyword set, ten sentence patterns, fifteen statement types and five values for the Type field.Sat, 15 Aug 2026 07:00:00 GMThttps://gytisgurklys.eu/en/posts/information-transformation-in-software-engineering/https://gytisgurklys.eu/en/posts/information-transformation-in-software-engineering/A six-level model describing software development as an information transformation from unspoken business intent to a working system: an artifact registry, a role model and a detailed analysis of the business analyst's work.Sat, 08 Aug 2026 07:00:00 GMThttps://gytisgurklys.eu/en/posts/restricting-enumeration-values-in-requirements-specifications/https://gytisgurklys.eu/en/posts/restricting-enumeration-values-in-requirements-specifications/A field must accept only part of an existing enumeration. Define a narrower enumeration, or keep the full list and state the restriction as a rule? A decision rule drawn from subtyping, type systems and derivation by restriction.Sat, 01 Aug 2026 07:00:00 GMThttps://gytisgurklys.eu/en/posts/theoretical-basis-for-modeling-the-eudamed-domain/https://gytisgurklys.eu/en/posts/theoretical-basis-for-modeling-the-eudamed-domain/A theoretical basis for modeling the EUDAMED domain: a real entity, an MDR-defined role and a EUDAMED record are three separate sorts, not one thing under different names, grounded in foundational ontology, institutional-fact theory and compliance theory.Fri, 07 Feb 2025 08:00:00 GMThttps://gytisgurklys.eu/en/posts/on-business-rules/https://gytisgurklys.eu/en/posts/on-business-rules/Slides from a 2020 talk on business rules: a survey of colleagues that showed uneven practice, and what the OMG SBVR standard says about writing them.Tue, 10 Mar 2020 08:00:00 GMThttps://gytisgurklys.eu/en/posts/on-business-requirements/https://gytisgurklys.eu/en/posts/on-business-requirements/Slides from a 2018 talk on what business requirements are and how they differ from a specification — with the answer looked for in Michael Jackson's problem frames.Thu, 20 Dec 2018 08:00:00 GMT