Exercises are conducted to improve emergency readiness through evaluating plans and identifying gaps, with the main goals being to clarify roles, improve coordination, and enhance individual and team performance. Exercises range from discussion-based types like seminars, workshops and tabletops, to operations-based drills, functional exercises, and full-scale exercises which involve greater resource deployment and simulate or enact emergency responses. The document outlines a building block approach where exercises increase in complexity and scale to provide practice across all levels of operations.