"SOA is, by definition, about achieving business agility through the use of business services. So a SOA business case must describe the benefits in those terms and not in terms of technical goals."
That is what Piet Jan Baarda states in a brilliant article on how the create a business case for SOA.
The business case for SOA can be found in the following scenario’s, he says:
1. Products and services
6. Business to business
7. Combinations of the above
And he continues: "When no such case is found SOA is still applied as an architecture style. It allows you to tackle opportunities just in time. Without SOA great opportunities may be missed."
The article is published as a 10-page PDF-file and is really the best one on SOA a came across lately!
Well done, Piet Jan!