-Developed by Philippe Kruchten, Ivar Jacobson, and others at Rational Software

-Now a commercial product

• Complements other UML (Universal Modeling Language) based products

• Customizable framework 

• Prescriptive guidelines, templates and examples

-Not a "Light" Process

• Over a dozen "disciplines" (rows in figure below)

• Over a hundred artifacts need to be defined

• Even less light as practiced by some organizations (using a waterfall model)

-Work done in iterations

[ From Ref. 3]