The CED-DA Re-Identification (Re-ID) User Guide is a tool for colleagues and stakeholders to conduct re-ID studies. This module introduces the concept of re-ID as a quality assurance tool for both technical and non-technical users. Sections of this module include the motivation behind re-ID studies, how re-ID is related to quality metrics found in other quantitative applications (e.g., hypothesis testing), metrics, methods, and future enhancements.