Categorical Exclusions refer to a type of environmental review process that determines whether certain actions or projects are excluded from the requirement of undergoing a more rigorous environmental review. This specialized skill involves a thorough understanding of the environmental laws and regulations and the ability to apply them to specific projects or actions. It requires expertise in analyzing data, conducting research, and evaluating potential impacts on the environment. Those who possess this skill are able to streamline the review process and ensure that projects are in compliance with environmental standards.