The document provides guidance on preparing for and undergoing a regulatory inspection of a clinical trial site. It outlines the objectives of inspections, why sites may be selected, who will conduct the inspection, what materials will be reviewed, and tips for how to interact with inspectors in an open and cooperative manner. The inspection process typically involves an opening meeting, personnel interviews, document reviews, and a closing meeting and can take around one week to complete. Proper preparation is key to facilitating a smooth inspection.