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The Geotextiles Standardization Committee, The Japanese Society of Soil Mechanics and Founda­tion Engineering, prepared a new draft of the Society’s Norm JSF T 941: Determination of Soil-Geosynthetic Frictional Behaviour by Direct Shear and/or Pull-out Tests. This paper describes the testing procedures of mea­suring a frictional resistance of geosynthetic to soils compacted in a container. The tests are applicable to gcosyn­thetics such as geowoven, geononwoven, geoknit, geonet, geogrid and geotextile-related products. The standard test methods consists of a direct shear friction test of determining the interface friction parameters, cs and o s, and a pull-out test of determining the pull-out frictional parameters, Cr and o p, where c and o components are an adhesion and an angle of friction, respectively.