Some other related documents from the SEI are:
- Systems of Systems: Scaling Up the Development Process; by Watts Humphrey. SEI Technical Report CMU/SEI-2006-TR-017
- Documenting Software Architectures in an Agile World; by Paul Clements, James Ivers, Reed Little, Robert Nord, Judith Stafford. SEI Technical Note CMU/SEI-2003-TN-023
- Integrating Software-Architecture-Centric Methods into Extreme Programming (XP); by R. Nord, J. Tomayko and R. Wojcik. SEI Technical Note CMU/SEI-2004-TN-036, ADA431084
- Using Earned Value Management (EVM) in Spiral Development; by Lisa Brownsword, Jim Smith. SEI Technical Note CMU/SEI-2005-TN-016
See! Not everything from the SEI is about CMM or CMMI ;-) They also a have a wealth of resources on Software Architecture and Software Product-Lines and other areas of Software Engineering!