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Are there any differences between the Rational Unified Process (RUP) and the Unified Process (UP)? What does "Rational" mean, in this context?

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I thought Rational is the name of a company? –  tp1 Nov 17 '11 at 20:05

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The Unified Process is a generic name for a family of process models that meet a number of criteria, such as being iterative and incremental, driven by use cases, and focus on addressing risks early. It defines four project phases: Inception, Elaboration, Construction, and Transition.

The Rational Unified Process is a refinement of the Unified Process that was created by Rational Software (now owned by IBM). It uses a series of software tools along with a process framework to define how to carry out the activities needed to run a software project, yet still provides a framework for tailoring to meet an organization's (or team's) needs.

Other refinements on the Unified Process include Scott Ambler's Agile Unified Process and the Eclipse Foundation's Open Unified Process.

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It seems I started writing my answer while you were writing yours, but I posted first (didn't get the familiar notification that another answer was up while writing). Just a clarification, wouldn't dare submit and answer saying exactly the same as another answer (and in this case less). I've deleted mine, as yours is more informative (and mine a little snarky). –  Yannis Rizos Nov 17 '11 at 18:32
    
Yeah. I got the notification that there was another answer posted as I was getting the links to the AUP and OUP. I figured since I was almost done, I was just going to post it anyway. –  Thomas Owens Nov 17 '11 at 18:34

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