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White paperCognitai Research Department18 min read
The bottleneck is use, not collection
Evidence review since August 2025 · Version 1.0, October 2026
A common view holds that clients will not provide data between psychotherapy sessions. This narrative review of peer-reviewed sources from 2020 onward finds that the view comes largely from self-guided apps. In clinical care, clients provide repeated data, and feeding it back to clinicians is associated with small average benefits and larger ones for clients who are not on track. The bottleneck is use: turning that data into something a therapist can interpret, trace to its source and act on. The paper proposes seven design principles, offered as hypotheses, and states the limits of the evidence.