Which pair of tools are commonly used in root cause analysis after a patient safety event?

• A. SWOT analyses and scenario planning
• B. Ishikawa diagrams and the 5 Whys
• C. Risk matrices and control charts
• D. Gantt charts and Pareto charts

Answer: (B)

Root cause analysis after a patient safety event relies on structured, collaborative methods that help uncover underlying factors rather than placing blame. The best pair is the Ishikawa diagram and the 5 Whys. The Ishikawa diagram, or fishbone diagram, organizes possible causes into categories such as people, processes, equipment, environment, policies, and communication, giving a visual map of how different factors may have contributed to the incident. The 5 Whys technique asks why repeatedly—often five times—to drill down from the initial failure to the root cause, typically revealing systematic gaps in processes, training, handoffs, or system design. Together, they focus on identifying systemic vulnerabilities and guiding corrective actions to reduce recurrence and improve patient safety.

Other tools mentioned are more about planning, measurement, or project management rather than diagnosing the specific causes of a safety event. SWOT analyses and scenario planning are for strategic direction; risk matrices and control charts relate to risk assessment and monitoring; Gantt and Pareto charts address timelines and prioritizing issues, not the in-depth cause analysis needed for root-cause investigation.