the RAD for UML

I try to find a site to learn UML and I’ve found this site http://odl-skopje.etf.ukim.edu.mk/uml-help/
where they tell about Rapid Application Development to represent UML diagrams and succeed to make an information system. I want to know if some of you know this process for UML and if it is recommanded by OMG as the UP process.

Thanks for your answers.