This document discusses root cause analysis (RCA) processes for wind turbine blade failures. It recommends conducting an RCA after a blade fails to obtain a thorough understanding of the failure, inform risk assessments, and identify corrective actions. The document outlines the key steps in an RCA process according to international standard IEC 62740, including establishing facts through careful visual and thermal inspections of the failed blade. It also recommends using visualization tools to analyze data and present RCA results, while maintaining flexibility to adapt the process to each failure. The overall message is that RCAs should be conducted for all blade failures to uncover risks and actions that might otherwise be missed.