A lot of companies are moving or intend to move to SOA. Naturally, they are asking what the prerequisites are to be successful with SOA. Im sure there are many, but one that doesnt get much consideration is good program management. The reason program management capability is a prerequisite to SOA is because:

1. The highest value in SOA comes from the reuse of services (as opposed to initial use). To ensure you are getting value from SOA, you must monitor your service inventory over time to observe reuse being realized. Most project structures are only concerned with the benefit achieved through instantiation, not the benefit of reuse.
2. Services must be designed for future use to be reused and not rely solely on luck. This doesnt mean that every future function of a service has to be designed and written during the creation of the service. But it does mean that every function that is written for the initial service should consider future possibilities for reuse while being designed.
3. Designing services for future reuse usually requires investigation outside the boundaries of traditional project structures. Most project structures are oriented around solving a specific problem currently being faced, usually by a specific department willing to sponsor the project. Such project structures are unable to support the weight of considering uses outside of the sponsoring department needs much less the potential uses in the future.
4. Designing services for future reuse requires an outside-in perspective. Ultimately, the experiences customers have trying to use your products or services to solve their problems drive the potential future use of services. So not only does service design push departmental boundaries, but it also pushes outside the internal organization of the company itself. Again, this kind of scope is not typical of traditional project structures.

So what is needed is structure that has a duration that lasts beyond the scope of any one execution project and investigates future opportunities for reuse during design activities while considering needs across departments from an outside-in customer perspective. This mechanism should manage the value realized of business services over a period of time that encompasses their reuse. In my opinion, this mechanism is program management when at its best. Without it, the result is an SOA with redundant services and/or higher development and deployment costs from constantly changing functionality within existing services.