The SUPMAP-project has the ambition to test the national boundaries of the operationalisation of the key indicators, as defined by the European Commission and further developed by EMCDDA. We take the liberty to appraise within the three given parameters whether additional key indicators can be developed. This feasibility study uses Belgium as a test-case and hereby supports the conceptual development of these indicators by the European Monitoring Centre on Drugs and Drug Addiction (EMCDDA). The harmonization with the EMCDDA is a necessity for this project. The interaction between a feasibility study conducted at national Belgian level and the process development at EMCDA level will mutually increase their effectiveness.