UTP — Simplification of the Standalone Model

There are certain concepts in the standalone model which are of no use to the user: the default application, validation action and log action belong to behavior, which is not described in the standalone model. Hence, a tool vendor cannot really handle these concepts, e.g. a user could not really define a validation action outside of a context of a concrete behavioral specification.
Another view on this: we need for a tool vendor a compliance level which is an intermediate step from their existing tools to the standalone model. This compliance level should exclude the behavior definition, i.e. it should be open to any kind of test behaviors.

see ptc/2004-04-10