Background: The Moti-4 intervention was developed to prevent addiction and other health problems among vulnerable adolescent cannabis users. The aims of Moti-4 are to reduce the use of cannabis among adolescents and to encourage their motivation to change their behavior. Methods: Intervention Mapping, a systematic approach to developing theory- and evidence-based interventions, was used to develop a protocol for the intervention. The process of developing the intervention also used the method of responsive evaluation to explore the opinions of the immediate target group and intermediaries (N = 31). Feasibility was assessed in 9 interviews and analyzed in grids. Results: Using Intervention Mapping resulted in the development of a substantial four-session intervention with a clear manual and training for prevention workers. The choice of 12 consecutive steps was based on the Trans Theoretical Model of Behavior Change, Motivational Interviewing, Theory of Planned Behavior and the Self Determination Theory. Conclusion: Intervention Mapping proved to be a useful approach for the development of the intervention, using a productive combination of theory and community knowledge. The pre- and post-test pilot study showed that the intervention generally brought about a considerable positive change in the two principle targets, cannabis use and motivation. There is a need for further (controlled) research into its effectiveness and implementation as a standard method in addiction prevention services.

Adolescents, Alcohol and drug prevention, Cannabis, Evidence-based interventions, Intervention Mapping, Motivational Interviewing, Targeted prevention,
BMC Public Health
Erasmus MC: University Medical Center Rotterdam

Dupont, H.B, Lemmens, P, Adriana, G, van de Mheen, H, & de Vries, N.K. (2015). Developing the Moti-4 intervention, assessing its feasibility and pilot testing its effectiveness. BMC Public Health. doi:10.1186/s12889-015-1826-y