The top-level model views are often referred to as the 4+1 or 3+1 view of UML diagrams. In Rose, each view represents a different way to look at the same system you are modeling, but from different levels of abstraction.
Compared to Rose, you have more freedom to organize your model
at a higher level. Upon import, each use case, logical, component,
and deployment view will appear in the Project Explorer view,
but as top-level packages. The new UML modeling products give you
the flexibility to capture architectural views as separate models,
or as actual diagrams in the models that they are views of; for example,
you can model the use-case view as a diagram in the use-case model
file.