In measurement concept management we differentiate between three concepts - classes, models and instances.

A measurement concept class defines the technical and physical structure of the installation structure. A measurement concept model defines the commercial structure. A measurement concept model is always based on a measurement concept class. You can build different Measurement Concepts (MCs) models based on the same class which we will see later on in the energy-feed in use case.
A measurement concept instance is a concrete representation of a MC model at a specific end-customer's address.