A CAPA (Corrective and Preventive Action plan) is written to address problems identified in clinical research studies. It outlines the root cause of the problem, corrective actions taken to resolve the issue, and preventive measures to avoid future occurrences. The CAPA should be authored by the responsible party, focus on solutions rather than blame, and include a root cause analysis, corrective actions, and preventive actions. It follows a specific template that provides the issue, analyses, resolutions and plans for evaluation. The completed CAPA is submitted to the IRB and site monitors to document handling of issues.