Deposit contracts involve participants depositing their own money and earning it back contingent on behavior change. Deposit contracts are empirically supported treatments for promoting health behavior, but they have a history of poor uptake. We compared the effectiveness and acceptability of technology-based versus in-person deposit contracts for…

A socially valid behavior-change intervention is broadly defined to be directed to a problem of verifiable importance, be accepted and used appropriately by target groups, and reduce substantially the probability of the problem's occurrence in target populations. The definition is applied to a family-based program to prevent human immunodeficiency…