Additional Info
Participants almost never quit the science. They quit the fourth unreimbursed parking fee, the diary app that logs them out, the site that’s a two-hour drive with no one to drive. Each is trivial to fix – if anyone knows in time. This product stays in touch with every participant at a cadence no site staff could sustain, collects outcomes as conversation rather than homework, and hears the early signals of drift: a missed dose mentioned in passing, a ride that fell through, a side effect being quietly endured. Then it fixes what it can on the call and flags the site when it can’t. Retention becomes something the study does continuously.