The present study evaluated a new 30-day Web-based contingency management program for smoking abstinence with 4 daily-smoking adolescents. Participants made 3 daily video recordings of themselves giving breath carbon monoxide (CO) samples at home that were sent electronically to study personnel. Using a reversal design, participants could earn…

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…