UML is what you need to learn - Rational Rose is merely a tool that helps out.
From my own limited experience, Visio is a much easier tool to use then anything Rational (IBM) puts out.
Too be honest though, I hate using a tool to do UML. The only time I've had to produce UML for others was in school - otherwise I simply draw the diagrams out on paper for my own reference. I've yet to work in a place that actually makes UML part of their development practice.
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