This document provides guidance on error management using tools like RCA, 5Whys, and CAPAs. It outlines how to define the problem, understand the root cause using 5Whys, and plan and implement corrective and preventive actions. The 5Whys method involves asking "Why?" repeatedly to determine the root cause of an error. It recommends documenting the error, taking immediate containment actions, investigating to find the likely cause, and using 5Whys to identify the root and contributing causes in order to implement effective corrective and preventive actions. Using 5Whys helps separate symptoms from underlying causes and get to the systemic root of problems.