If a company discovers GIS as a usefull tool, it normally starts with a few desktop GIS (most likely QGIS) users. Later on, if GIS is more widely used within the company, the need for a spatial data infrastructure (SDI) arises. This presentation shows how to step-by-step create a slim SDI around QGIS, which other software components can be used, their advantages and disadvantages and how they play together with QGIS.