This project type uses two modules. The Longitudinal module allows any data collection instrument(s) to be completed multiple times for each record. The Scheduling module adds record-specific schedules onto a study calendar, using the longitudinal event grid. Schedules can be generated and modified. The longitudinal module is best suited to very structured studies which do NOT last indefinitely. So this project type is useful for large, multi-site clinical trials needing a quick and easy way to schedule patient visits.