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This section defines the concepts associated with object implementation (i.e., the concepts relevant to realizing the behavior
of objects in a computational system).
The implementation of an object system carries out the computational activities needed to effect the behavior of requested
services. These activities may include computing the results of the request and updating the system state. In the process,
additional requests may be issued.
The implementation model consists of two parts: the execution model and the construction model. The execution model describes
how services are performed. The construction model describes how services are defined.