A means of performing a Business Function (an ability that an organization possesses, typically expressed in general and high level terms and requiring a combination of organization, people, processes and technology to achieve).
A Business Service may provide one means of accessing a particular Business Function. The operation of a Business Service will perform one or more Business Processes.
The explicitly defined interface of a Business Service can be seen as representing a "service contract". If particular inputs are provided then the service will deliver particular outputs in compliance within specific parameters (for example, within a particular period of time).
Note: The interface of a Business Service is not necessarily IT based. For example, a typical postal service will have a number of service interfaces:
- Public letter box for posting letters
- Counter at post office for interacting with postal workers