Details of the Rumbaugh method, more formally
known as the Object Modeling Technique (OMT),
are contained in the following two books:
[Rumbaugh 1991] J. Rumbaugh, M. Blaha, W.
Premerlani, F. Eddy, and W. Lorensen,
Object-Oriented Modeling and Design,
Prentice-Hall, 1991.
[Rumbaugh 1996] James Rumbaugh, OMT
Insights: Perspectives on Modeling from the
Journal of Object-Oriented Programming, SIGS
Books (Cambridge University Press), 1996.
You should also be aware that James Rumbaugh
was one of the creators of the Unified Modeling
Language (UML), which has largely superceded
OMT.
