3 skills.
Use when asked to investigate an incident/accident using CAST (Causal Analysis based on System Theory) — a blame-free, systems-view accident analysis technique built on STAMP/STPA — grounded in joelparkerhenderson/causal-analysis-based-on-system-theory, as distinct from single-root-cause analysis.
Use when asked to apply queueing theory to software/business processes — arrival/service rate notation, utilization ratio, Little's Law, or DORA/MTTR metrics derived from queue behavior — grounded in joelparkerhenderson/queueing-theory.
Use when asked to name, define, or choose system quality attributes (SQAs) — non-functional requirements like reliability, scalability, observability, maintainability — for a software system or organizational practice, distinct from functional requirements — grounded in joelparkerhenderson/system-quality-attributes.