ISO/TS 13399-202:2015 specifies a concept for the design of cutting items, limited to any kind of irregular inserts, with the usage of the related properties and domains of values. It specifies a common way of designing simplified models that contain the following: - definitions and identification of the design features of irregular inserts, with a link to the properties used; - definitions and identification of the internal structure of the 3D model that represents the features and the properties of irregular inserts. The following are outside the scope of this part of ISO 13399: - applications where these standard data may be stored or referenced; - creation and exchange of simplified 3D models for cutting tools; - creation and exchange of simplified 3D models for tool items; - creation and exchange of simplified 3D models for other cutting items not described in this part of ISO 13399; - creation and exchange of simplified 3D models for adaptive items; - creation and exchange of simplified 3D models for assembly items and auxiliary items.