Stateless Services:

 - Increase scalability.

 - Increase reusability.

Design Considerations

 - Service should not maintain business process-specific state logic.

 - Contracts (messages) allow for transmission of state information.

 - Use declarative programming languages capable of processing state information delivered in messages and responding to a wide range or requests.

 - Not all services need be (or can be) stateless, but developers need to understand the trade-offs.