Failure Mode and Effects Analysis (FMEA) is a long-established technique used initially by the U.S. military to identify potential failures in various processes and has been applied to modern computer systems to improve their reliability. The rise of cloud computing and microservices has introduced new complexities and potential failure points, making traditional testing inadequate for today's large-scale systems. Chaos Engineering complements FMEA by deliberately introducing controlled failures into systems to uncover vulnerabilities and assess system responses, thus enabling faster identification and mitigation of potential issues without impacting customers negatively. By employing both FMEA and Chaos Engineering, organizations can enhance system reliability and resilience, aligning risk assessment and failure detection goals with modern distributed systems' needs. This combination helps organizations prioritize improvements and meet service-level objectives more effectively, ultimately leading to more reliable and customer-satisfactory systems.