Where can I find out more about the Rumbaugh Method?

John Moore

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also be aware that James Rumbaugh was one of the creators of the Unified Modeling Language (UML), which has largely superceded OMT.