This part of ISO 16610 is a geometrical product specification (GPS) standard and is to be regarded as a general GPS standard (see ISO/TR 14638). It influences chain links 3 and 6 in the GPS matrix structure. The ISO/GPS Masterplan given in ISO 14638 gives an overview of the ISO/GPS system of which this part of ISO 16610 is a part of. The fundamental rules of ISO/GPS given in ISO 8015 apply to this part of ISO 16610 and the default decision rules given in ISO 14253-1 apply to the specifications made in accordance with this part of ISO 16610, unless otherwise indicated. This part of ISO 16610 also develops the terminology and concepts for GPS filtration. This part of ISO 16610 generalizes the concept of filtration. The series of ISO 16610 presents a toolbox of filtration techniques to enable the user to choose an appropriate filter for the functional requirements. They are fundamental International Standards upon which other ISO documents are built. This document (EN ISO 16610-1:2015) has been prepared by Technical Committee ISO/TC 213 "Dimensional and geometrical product specifications and verification" (Secretariat: DS, Denmark) in collaboration with Technical Committee CEN/TC 290 "Dimensional and geometrical product specification and verification", the secretariat of which is held by AFNOR (France). The responsible national committee is Working Committee NA 152-03-03 AA "Oberflächen" ("Surfaces") of DIN Standards Committee Technical Fundamentals (NATG).