Towards a Worker-Centered Framework for Categorizing Procedural Adaptations

Safety science has developed extensive taxonomies for categorizing human performance failures but lacks equivalent vocabulary for describing successful work performance, leaving practitioners without adequate language to discuss adaptive practices that enable successful work under varying conditions. This study developed a worker-centered framework for categorizing procedural adaptations through empirical research at a petrochemical facility. The research employed three-phase convergent validation: Phase 1 captured behavioral data through video observation of 1422 procedural steps; Phase 2 documented differences between Work-As-Imagined and Work-As-Done using the Skip-Order-Action Framework with subject matter expert interpretation; Phase 3 evaluated emerging patterns through worker interviews. Analysis revealed that 32.9% of procedural steps showed adaptations, yet all tasks were completed successfully. Three distinct categories emerged from convergent evidence: routine adaptations represent normalized workplace practices; efficiency adaptations optimize workflow while maintaining safety standards; and safety adaptations exceed prescribed requirements through additional verification. The resulting Routine-Efficiency-Safety (RES) framework provides practical vocabulary for Safety-II implementation, enabling organizations to distinguish between different types of procedural adaptations and their functions, moving beyond binary compliance assessments toward learning-focused conversations about successful work practices.