Requirements for Service Oriented Architectures

It looks like I'm mixing my requirements and design concepts, but I think that's a lot to be said for capturing requirements based on service oriented architectures. As we move towards a portfolio-based IT delivery model, as opposed to an application-specific model, service oriented models become more important.

I use the term SOA as it is more of a buzzword, but I really mean service oriented models. Anyway, there's an article on RationalEdge that discusses this - check out
http://www-128.ibm.com/developerworks/rational/library/jul05/johnston/index.html