Large scale distributed systems have unpredictable and complex outcomes that are costly when incidents occur. This session will cover the foundations of Chaos Engineering and how the craft has evolved to advance DevSecOps and Incident Response. Chaos Engineering allows for Incident Response teams to experiment on recurring incident patterns to determine underlying factors within the environment that are causing frequent repeat incidents. Furthermore using Chaos Engineering techniques, allows incident response and product teams to derive new information about the state of security within the system that was previously unknown. Within this new paradigm of instrumentation where we proactively conduct “Pre-Incident” vs. “Post-Incident” reviews we are now able to more accurately measure how effective our incident response teams, tools, skills, and procedures are during the manic of the IR function.