This course explores the essentials of longitudinal trials, where data is collected from the same subjects repeatedly over time to track specific changes or trends. You will learn how to configure REDCap projects specifically for these multi-event timelines, moving beyond basic data collection to master automated survey invitations, logic, and piping. By utilising Smart Variables and understanding the unique longitudinal data structure, you will gain the skills to build efficient, automated research workflows that maintain data integrity across every stage of your study.