Specialized training is necessary for health-care providers such as physicians, nurses, and social workers, to be able to accurately perform decision-making capacity assessments (DMCAs). With an increasing demand for flexible, accessible education, there is growing interest in utilizing online training modules to keep health-care providers up to date on current best practices in DMCAs. This study evaluates the effectiveness of online training modules in enhancing clinicians' self-reported knowledge, confidence, and comfort with the core concepts necessary to conduct DMCAs.