Does ISO-Grounded NFR Specification Improve LLM Code Generation? A Comparison of Rich and Structured Interventions against a Natural-Language Baseline
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Computer Science > Software Engineering
arXiv:2608.13742 (cs)
[Submitted on 13 Aug 2026]
Title:Does ISO-Grounded NFR Specification Improve LLM Code Generation? A Comparison of Rich and Structured Interventions against a Natural-Language Baseline
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Abstract:In LLM-based code generation, Non-Functional Requirements (NFRs) are often specified as terse one-line phrases. We ask whether grounding those specifications in ISO/IEC 25010 Quality Model, either as rich natural-language prose (NL-rich) or as structured JSON (Structured), improves code generated on HumanEval/HumanEval-ET compared to a RobuNFR-style one-line baseline (NL-simple). We evaluate four NFRs (performance, error handling, code smell, readability) with ten prompt variations per condition under a fixed model snapshot and paired non-parametric analysis. Primary finding: ISO-grounded enrichment improves static quality proxies (unreadability density falls across all four NFRs (e.g., Performance 0.88 -> 0.69 for NL-rich)) and reduces sensitivity to prompt wording, but does not reliably improve functional correctness; for error handling, extended-test pass rate decreases, suggesting tension between defensive coding patterns and exact-output benchmarks. Secondary finding: when ISO content is held constant, NL-rich and Structured differ negligibly in correctness (|delta| <= 0.023), indicating that semantic content matters more than JSON-vs-prose format. Practitioners should invest in standard-grounded NFR content rather than serialization form. A fully traceable replication package is provided.
| Comments: | 11 pages, 2 figures, Accepted for publication at the 20th Brazilian Symposium on Software Components, Architectures, and Reuse (SBCARS 2026) |
| Subjects: | Software Engineering (cs.SE); Artificial Intelligence (cs.AI); Machine Learning (cs.LG) |
| Cite as: | arXiv:2608.13742 [cs.SE] |
| (or arXiv:2608.13742v1 [cs.SE] for this version) | |
| https://doi.org/10.48550/arXiv.2608.13742
arXiv-issued DOI via DataCite (pending registration)
|
Submission history
From: Vinicius Garcia Cardoso [view email][v1] Thu, 13 Aug 2026 19:58:01 UTC (67 KB)
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View a PDF of the paper titled Does ISO-Grounded NFR Specification Improve LLM Code Generation? A Comparison of Rich and Structured Interventions against a Natural-Language Baseline, by Jo\`ao Pedro Monteiro Pereira and Vinicius Cardoso Garcia
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