This part of ISO 13399 specifies a reference dictionary for connection systems for cutting tools, together with their descriptive properties and domains of values. This part of ISO 13399 specifies a reference dictionary that contains a) definitions and identifications of the classes of connection systems for cutting tools, with an associated classification scheme, b) definitions and identifications of the data element types that represent the properties of connection systems for cutting tools, c) definitions and identifications of domains of values for describing the above data element types. Each class, property or domain of values of this application domain constitutes an entry of the reference dictionary defined in this part of ISO 13399. It is associated with a computer-sensible and human-readable definition, and with a computer-sensible identification. Identification of a dictionary entry allows unambiguous reference to it from any application that implements the information model defined in ISO 13399-1.1) The following is within the scope of this part of ISO 13399: — standard data that represent the various classes of connection systems for cutting tools; — standard data that represent the various properties connection systems for cutting tools; — standard data that represent domains of values used for properties of connection systems for cutting tools; — a single implementation method by which the standard data defined in this part ISO 13399 can be exchanged (see ISO 10303-21). The following is not within its scope: — specialized or expert knowledge on the design and use of cutting tools; — rules used to determine the information that should be communicated; — applications where these standard data may be stored or referenced; — implementation methods other that the one defined in this part of ISO 13399 by which the standard data can be exchanged and referenced; — information models for cutting tools; — definitions of classes and properties for cutting items, tool items, assembly items, adaptive items, or for reference systems and common concepts, these being covered by other parts of ISO 13399.