Planet Youth is the local adaptation and implementation, in Galway, Mayo, and Roscommon, of the Icelandic Prevention Model (IPM). The Planet Youth study administers a biennial lifestyle questionnaire to 15–16-year-olds in the target community. In this instance the target community was all 80 of the post primary schools, and 10 Youthreach Centres, in Galway, Mayo and Roscommon. The purpose of the study is to examine the risk and protective factors in the lives and social environment of young people and to generate the data that will inform the development of community-based preventative interventions to address same. Interventions developed are in the four domains of: Parents and Family School Leisure time and local community Peer group

Total universe/Complete enumeration. All students in their post Junior Cert year in the 80 post-primary schools and 10 Youthreach centres in the region were invited to participate.There are 4,542 post Junior Certificate pupils within the dataset. The Department of Education lists 6,574 pupils that sat the Junior Certificate in Galway, Mayo, and Roscommon. Thus there are 69% of the target population contained in the dataset. The 31% that are missing self-excluded from the survey or were absent on the day of the survey.

Self-administered questionnaire: Computer-assisted (CASI)