This document sets out the basic terminology for partition features and the framework for the fundamental procedures used in partition. The approach is based on the concept of a single surface (single line), where a nominal model is first partitioned into a set of singular surfaces which become an initial set of partition features. This initial set of partition features can then be modified, if required, by GPS modifiers from the specification, to obtain the require set of partitioned features of design intent. This approach allows interpretation of the specification to determine the required set of partition features of design intent in specification and also allows algorithms to be developed that compute the linked measured partition features in verification.