Objectory

At the time Rational and Objectory were two of the dominant players in the small world of independent vendors of Object-Oriented tools and methods. citation The Object Management Group then picked up and took over ownership of the UML.

Ivar Jacobson 's Objectory, Shlaer-Mellor,and Yourdon-Coad were also popular.

This was followed by Booch's company Rational Software purchasing Ivar Jacobson's Objectory company and merging their model into the UML.