A systematic computer-based literature search was conducted within the databases of PubMed, PsycINFO and Addiction Abstracts. The four cannabis screening instruments ("Severity of Dependence Scale" in combination with "cannabis", as well as "Cannabis Abuse Screening Test", "Cannabis Use Disorders Identification Test" and "Problematic Use of Marijuana") were used as broad search terms in order to gather peer-reviewed articles citing any use of these measures with no specific time frame. This search was complemented by screening the World Wide Web as well as the literature lists of retrieved publications for further references on the subject. Articles were included if they evaluated at least one psychometric property concerning reliability or validity. Articles were excluded if the target questionnaires were used to only measure the validity of another instrument. Articles were also excluded if the instruments were used as screening tools to identify cannabis-related problems but no data on reliability or validity were presented.
