In the UML, visual modeling is an arrangement of so-called
classifiers
A is a model element that describes the system’s
behavior or structure and that normally has a visual
representation
Examples of classifiers include class, actor, use case,
relationship
In a working system, classifiers manifest as objects
An is a piece of software that has
state - defined by its attribute values
behavior - defined by services (operations) that an object
can perform
identity – to differentiate betw