Incident Investigation & Root Cause Analysis

The Incident Investigation and Root Cause Analysis course from the American Institute of Safety Professionals provides comprehensive training on the systematic investigation of workplace incidents to determine not just what happened (the immediate cause) but why it happened (the root causes and systemic failures) and what must change to prevent recurrence. Most incident investigations stop too soon: they identify the worker’s error or the equipment failure and implement a corrective action directed at that immediate cause. Effective investigations go deeper: they identify the management system failures, organisational factors, and cultural conditions that allowed the immediate cause to exist. An investigation that finds only “worker error” has failed because it has not identified what the system failed to provide.

The curriculum covers investigation planning and team formation, evidence collection and preservation (physical evidence, photographs, documents, data), witness interviewing techniques (open-ended questions, timeline reconstruction, avoiding leading questions, managing reluctant witnesses), root cause analysis methodologies (5-Why analysis, Fault Tree Analysis, Systematic Cause Analysis Technique (SCAT), TapRooT awareness, Fishbone/Ishikawa), the distinction between immediate causes, contributing factors, and root causes, recommendation development (specific, measurable, assigned, resourced, time-bound), corrective action implementation and verification, investigation report writing, OSHA investigation requirements (§1904.39 reporting, PSM §1910.119(m) investigation), and investigation programme management (which incidents to investigate, investigation quality, trending, and organisational learning). All training is delivered 100 percent online through Microsoft Teams and the American Institute of Safety Professionals LMS. Upon completion, graduates receive a certificate, wallet card, and transcript, employer-verifiable at amiosp.com/student-verifications.

Upon completing this program, participants will be able to:

• Plan and initiate investigations: determining investigation scope, forming investigation teams (multidisciplinary, including worker representatives), establishing the investigation timeline, and the immediate actions (scene preservation, witness identification) that protect evidence.
• Collect and preserve evidence: physical evidence (damaged equipment, failed components, environmental conditions), photographic documentation, document collection (procedures, training records, inspection records, maintenance logs), electronic data (CCTV, telematics, access logs), and the evidence handling that maintains chain of custody.
• Interview witnesses effectively: creating a supportive interview environment, using open-ended questions, building timelines from multiple perspectives, avoiding leading or accusatory questions, managing reluctant or traumatised witnesses, and documenting witness accounts accurately.
• Apply root cause analysis methodologies: 5-Why (iterative questioning to reach systemic causes), Fault Tree Analysis (logical decomposition of the event into contributing factors), SCAT (Systematic Cause Analysis linking substandard acts/conditions to basic causes), and Fishbone/Ishikawa (categorising causes by people, procedures, equipment, environment, management).
• Distinguish immediate causes from root causes: the immediate cause is what the worker or equipment did wrong; the root cause is what the system failed to provide (inadequate training, deficient procedures, insufficient resources, poor design, absent supervision, cultural normalisation of risk). Finding only immediate causes guarantees recurrence.
• Develop effective recommendations: specific (exactly what will change), measurable (how success is verified), assigned (who is responsible), resourced (budget and authority allocated), and time-bound (deadline for implementation), with the recommendation that addresses the root cause, not just the immediate cause.
• Write investigation reports: executive summary, incident description, investigation methodology, evidence collected, analysis, findings (immediate causes, contributing factors, root causes), recommendations, and the report structure that communicates findings to management and drives corrective action.
• Manage the investigation programme: criteria for which incidents to investigate (all fatalities, hospitalisations, amputations, plus near-misses and high-potential events), investigation quality assurance, trending analysis across investigations, and the organisational learning that transforms individual investigations into systemic improvement.

Core Curriculum Topics

• Investigation Planning: scope, team, timeline, immediate actions
• Evidence Collection: physical, photographic, documentary, electronic, chain of custody
• Witness Interviews: environment, open-ended questions, timelines, reluctant witnesses
• 5-Why Analysis: iterative questioning, reaching systemic causes, avoiding premature stopping
• Fault Tree Analysis: logical decomposition, AND/OR gates, contributing factors
• SCAT: substandard acts/conditions, basic causes, systemic linkage
• TapRooT Awareness: structured investigation methodology overview
• Fishbone/Ishikawa: people, procedures, equipment, environment, management categories
• Immediate vs Root Causes: surface-level versus systemic, the system question
• Recommendation Development: specific, measurable, assigned, resourced, time-bound
• Corrective Action: implementation, verification, effectiveness review
• Report Writing: executive summary, description, analysis, findings, recommendations
• OSHA Requirements: 1904.39 reporting, PSM 1910.119(m) investigation requirements
• Programme Management: investigation criteria, quality assurance, trending, organisational learning

• No prior training required
• No academic degree required
• All instruction in English; working proficiency required

Upon completion, graduates receive an American Institute of Safety Professionals certificate, wallet card, and transcript. Employer-verifiable at amiosp.com/student-verifications.

• Safety officers who lead or participate in incident investigations
• Supervisors who conduct initial investigations and preserve evidence
• Safety managers who oversee investigation programmes and review reports
• Operations managers who implement corrective actions from investigations
• HR professionals involved in investigation processes
• Anyone designated to serve on investigation teams

• Incident Investigation and Root Cause Analysis — YOU ARE HERE
• Safety Leadership and Supervision (leading investigations with just culture)
• Safety Accountability Programs (accountability after investigation findings)
• CHSO / RHSO (certifications where investigation is a core competency)
•  International Diploma in Industrial Safety Management (investigation at diploma depth)