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Dan Pilone is a Senior Software Architect with Blueprint Technologies, Inc. He has designed and implemented systems for Hughes, ARINC, UPS, and the Naval Research Laboratory. He also teaches project management and software design and engineering at The Catholic University in Washington D.C. Dan is the author of several books on software development, including UML 2.0 in a Nutshell and UML 2.0 Pocket Reference (O'Reilly). Tracey Pilone, a licensed Civil Engineer, is a freelance technical writer who has worked on mission planning and RF analysis software for the Navy. She has a Civil Engineering degree from Virgina Tech and a Masters of Education from the University of Virginia.