Abstract: A complex business logic encapsulation system and method are provided. The system can encapsulate complex business logic, for example, for workflow application(s). The system includes a common business logic layer component that encapsulates the business logic of objects in a store. The common business logic layer can employ response objects which encapsulate the business logic of complex objects in the store. The response object provides one or more suitable responses. The client can then identify the appropriate response, populate the response and send it back to the common business logic layer component. Each response object can embed an invariant identifier of the store item to which it corresponds, and, when sent or saved through a web service, causes the store to behave as if it had been processed by system.