PI-Enroll® is a cell phone app specifically designed for busy clinical practices and hospital wards where patient encounter times can be limited. It can be applied to all clinical trials (Industry- or Investigator-Initiated). Amongst its many functions, PI-Enroll® provides salient information regarding study medication/intervention, inclusion and exclusion criteria, answers to common patient queries, comparisons between competing studies and a unique communication network that facilitates study team communication and coordination. It should be stressed that PI-Enroll® was developed by investigators for investigators and it is the Principal Investigator who determines and personalizes Enroll’s final content.