This ITU-T Recommendation | International Standard covers the concepts which are needed to perform the modelling of ODP systems (clauses 5 to 14), and the principles of conformance to ODP systems (clause 15).
The concepts defined in clauses 5 to 15 are used in the Reference Model of Open Distributed Processing to support the definitions of
a) the structure of the family of standards which are subject to the Reference Model;
b) the structure of distributed systems which claim compliance with the Reference Model (the configuration of the systems);
c) the concepts needed to express the combined use of the various standards supported;
d) the basic concepts to be used in the specifications of the various components which make up the open distributed system.