Description: Root Cause Analysis (RCA) testing is a systematic approach used in the software field to investigate and determine the underlying reasons for defects or failures in a system. This type of testing focuses on identifying not just the symptoms of the problem but also the causes that originate it, allowing development and quality teams to implement effective and lasting solutions. RCA testing is fundamental in the software development life cycle as it helps improve the quality of the final product and reduce the risk of error recurrence. Various techniques are used to carry out the analysis, such as Ishikawa diagrams, Pareto analysis, and the five whys, which facilitate the identification of causal relationships and patterns in defects. The relevance of RCA testing lies in its ability to transform the way errors are managed, promoting a culture of continuous improvement and learning within teams. By addressing root causes, organizations can optimize their development processes, enhance product reliability, increase customer satisfaction, and ultimately achieve more robust and dependable software.