How can I configure the workflow so that different types of messages are sent out to different people depending on how late the processing is?

Follow these steps:

1. Specify a deadline period for the step.

2. Specify a name for the event. This adds new branch from the step.

3. Add a new step to the branch which sends a mail message.

4. Add another step to the branch which sends out the second deadline warning (see mail steps above). Use deadlines in this step to configure an earliest start so that the second message is not sent until a further time has elapsed.

5. Repeat step 5 as often as you like.