Philippe Kruchten, The Rational Unified Process: An Introduction, 3rd Edition.
 Image modified from the Rational Unified Process (RUP) product.
 Image from Scott W. Ambler, John Nalbone, and Michael Vizdos, The Enterprise Unified Process: Extending the Rational Unified Process, Chapter 1.
 Scott W. Ambler, "Enhancing the Unified Process," Software Development, October 1999.
 Image courtesy of the Enterprise Unified Process (EUP) home page.
 Image courtesy of the Phases of the EUP web page.
 Laurie Williams and Robert Kessler, Pair Programming Illuminated.
 Scott W. Ambler, Agile Modeling: Effective Practices for Extreme Programming and the Unified Process.