Quality of Geo Web Services – Elements, Measures, Procedures ReinhardtWolfgang 2019 Geo Web Services (GWS) like for example the OGC WMS and WFS are widely used nowadays especially within the many regional, national and international Spatial Data Infrastructures (SDI). Therefore the quality of these Geo Web Services gains more and more importance. But till now there is no commonly accepted quality model for this purpose although an OGC work item related to this has been established recently. Within a project for the SDI of the Geographic Information Service of the German Federal Armed Forces we have defined elements, measures and related procedures to describe and to determine the quality of Geo Web Services and to deliver quality information (metadata) to the users. Some of the results of the project are outlined in this paper.