This part of ISO/TS 13399 specifies a concept for the design of turning tools for indexable inserts, together with the usage of the related properties and domains of values.This part of ISO/TS 13399 specifies a common way of designing simplified models that contain the following:— definitions and identifications of the design features of turning tools for indexable inserts, with an association to the descriptive properties and dimensions;— definition and identification of the 3D model internal structure that represents the features and the properties of turning tools for indexable inserts.