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April 7, 20260 citationsOpen Access

Does Spec-Driven Development Reduce Defects? An Empirical Test of Industry Claims Across 119 Open-Source Repositories

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BHBrenn Hill

Key Points

  • Assess whether spec-driven development leads to reduced defects in open-source software projects.
  • Conducted a large-scale empirical analysis across 119 open-source repositories.
  • Utilized within-author fixed effects for analysis.
  • Implemented JIT (Just-In-Time) defect prediction controls for accuracy.
  • No significant association found between specification presence and defect outcomes.
  • Specification quality showed no correlation with reduced defects.
  • Null results were consistent across various robustness checks.

Abstract

First large-scale empirical test of spec-driven development (SDD) quality claims. Within-author fixed effects and JIT defect prediction controls across 119 open-source repositories find no association between specification presence, specification quality, and defect outcomes. The null result persists across all robustness checks.

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Cite This Study

Brenn Hill (2026) studied this question.

synapsesocial.com/papers/69d49f8ab33cc4c35a227fc7https://doi.org/10.5281/zenodo.19432099
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