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Emergency readiness must be tested in realistic conditions. Unannounced drills provide the most accurate measure of how crews respond under actual circumstances: recognizing alarms, moving promptly to designated assembly areas, and supervisors accounting for all personnel. Key evaluation criteria include alarm audibility in all work zones, clarity of evacuation routes, signage visibility, and the accuracy of accountability systems (e.g., roll calls, badges). Prior notice drills may improve compliance temporarily but do not reveal gaps in recognition or timing under stress. Surveys can measure awareness but cannot confirm behavioral readiness. Reviewing plans in meetings helps knowledge but lacks performance validation. Documenting drill outcomes, identifying bottlenecks (e.g., stairwell congestion), and implementing corrective actions ensures continual improvement. The process aligns with CHST objectives by integrating emergency preparedness into site culture, validating the adequacy of physical systems, and reinforcing worker confidence. Coordination with local fire officials enhances realism and compliance with regulatory expectations.