The image shows a diagram of what happens when partial processing is used. The following actions take place:

1. The client BPEL process has four activities: invoke, receive, invoke, receive.

2. The call service invoke activity (which appear first) sends a request to the service BPEL process by way of the WSDL partner link.

3. The service BPEL process has four activities, each of which corresponds to the client BPEL process activities: receive, receive, invoke, receive.

4. Each of the activities in the service BPEL process passes data back to their appropriate activities in the client BPEL process.