GSI's Mission is to develop and transfer knowledge, assess and critique geosynthetics, and provide services to the member organizations.

The Geosynthetic Institute (GSI) is a consortium of organizations interested in, and involved with, geosynthetics.  All types of polymeric geosynthetic materials are involved: geotextiles, geomembranes, geogrids, geonets, geocomposites, geosynthetic clay liners, geopipe, geocells, and geofoam. The organizations include federal and state governmental agencies, facility owners, designers, consultants, QC and QA organizations, testing laboratories, resin and additive suppliers, manufacturers, manufacturer's representatives and installation contractors. GSI currently consists of 71 member organizations of which ca. 45% are international.