Clients are asked to imagine themselves in a particular situation and to rate their level of confidence (self-efficacy) to resist drug use in that situation. Each of the scale items represents a different situation in which a drug user might be tempted to use drugs. The DASES is a relatively brief and easy to use measure of self-efficacy. It is useful as an outcome measure because it has been demonstrated to predict subsequent drug use. There is evidence supporting the reliability and validity of the scale, although its use has been restricted to young multiple drug users (aged 16-30).