Reusable services:

 - allow services to be leveraged as part of different business applications / processes.

 - increase business agility by allowing new applications / processes to be rapidly implemented from existing services.

 - encapsulate generic logic exposed through a generic, extensible contract.

 - allow service logic to be accessed concurrently.

Note – not all services will be re-usable; some services will provide task-specific business logic that is only applicable to a single business process.