The IMPACT Collaboratory held its fourth annual Training Workshop on January 24-25, 2024. The 1.5-day virtual workshop included 87 participants from 54 institutions and featured all new material to build a foundation in practical aspects of designing and conducting ePCTs in Alzheimer’s disease (AD) and AD-related dementias (ADRD). Modules focused on: sample size estimation for cluster randomized trials, participant and community engagement, and partnering with healthcare systems for ePCTs.