Clos

• It offers multiple dispatch, or "multimethods".
• Therefore, methods are not considered to live within classes; they are conceptually grouped into generic functions instead.
• CLOS doesn't provide encapsulation; that is considered to be the job of a different part of Common Lisp, the package system.
• Inheritance can cause methods to be combined together in arbitrarily complicated ways at the discretion of the programmer, and not merely overridden by one another.
• CLOS is dynamic, meaning that not only the contents, but also the structure of its objects can be modified at runtime. CLOS supports changing class definitions on-the-fly (even when instances of the class in question already exist) as well as changing the class membership of a given instance through the change-class operator.

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