Agile software development has its own manifesto which lays out the values and principles of agile process. I have tried to look beyond (or may be just deeper into the meaning of) the essential four value statements in my article at TSS
http://www.theserverside.com/news/thread.tss?thread_id=48140
Top ones on my list
Rigid : The more rigid the architecture is, harder it is to change as very often an architecture has to adapt to changes and it might very well go much farther then it was initially designed for. When making a change in a component cascades changes in many more components, then we know we are in trouble. To break the rigidity always design to an interface, inject the dependencies, design the classes to do one thing and do it right so that they are enthrusted with single responsibility all the time. Follow the open-close principle keeping the pieces of architure which is going to change often (like configuration, data etc) from the ones which seldom changes.
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