7.1 5 Whys
Linear cause chain — ask Why up to 5 times. AI suggestions are capped at 7 levels deep.7.2 Fishbone (Ishikawa)
Groups causes into the 6M categories: Man, Machine, Method, Material, Measurement, Environment. Default skeleton renders the effect, 6 categories and 12 causes; add more by hand, up to 2 levels deep per branch.7.3 Fault Tree Analysis (FTA)
Top-down logic tree with AND / OR gates and basic / intermediate events.7.4 Swiss Cheese Model
Five standard barriers: Organizational, Procedural, Engineering, Supervision, Unsafe Acts. Holes represent failed defenses; alignment shows accident pathways.7.5 Root cause classification
Each cause node can be classified as Direct, Indirect or Contributing — these classifications carry into the AI summary and PDF report with a 1:1 mapping.7.6 AI help during investigation
- AI Cause — suggests next-level causes based on the current node
- AI CAPA — drafts corrective and preventive actions
- AI Summary — generates a category-aware executive summary
- Right-click any node to edit, delete or link evidence