The Drug Treatment Matrix maps the treatment of problem drug use among adults (another deals with alcohol-related problems) and for each sub-domain (a cell) lists the most important UK-relevant research and guidance. Across the top, columns move from specific interventions through how their impacts are affected by the widening contexts of practitioners, management, the organisation, and whole area or national treatment systems. Down the rows are the major intervention types implemented at these levels. Visit the matrices page for more on their origins and construction.