The Reference Information Model (RIM) is the HL7 version 3 model that is the basis for messaging.  The RIM is developed using object-oriented methods developed by computer scientists during the 1980’s.

The HL7 RIM, is based upon the Unified Service Action Model (USAM), which includes three generic classes:  services (actions), stakeholders (people), and material (things). On this basis, the RIM constructs its “backbone” classes–entity, role, and act—from which all other classes are derived.


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