The Compendium: Illicit and Psychotropic Drug Use, Risk/Harm and Intervention Indicators and Data for Ontario is compiled by the Ontario CRISM Node Team as a basic information resource for CRISM’s scope in Ontario. It draws on and compiles relevant – while select – data and information from a multitude of sources (including surveys, epidemiological/surveillance reports, various types of studies, others) intended as a resource for both scientific, policy/program, stakeholder and lay audiences in relevant fields and to support OCRINT/CRISM’s scientific and knowledge translation mission with data and information. The Compendium is meant as a 'living document', i.e. is designed to be updated with newly relevant information. The Compendium’s main content organization is by major drug categories, with sub-ordinated specific indicator (e.g., use, risks/harms, interventions) sub-sections further organized by (e.g., general, special) population categories.