One question that keeps popping up now and often is this.

What are the different Integration Scenarios for a BRMS with WWF?

Let me try and summarize all those that I can think of. Well, this is going to get technical.
A Little Background

A workflow is a set of Activities (or actions or tasks). The Activities can execute in 2 ways

• Sequential, as in specified when the Flow is Designed
• Event Driven, where the actual sequence of execution depends on the (external) events raised at runtime.

A more detailed treatment of Activities can be found here.

Basic Integration Scenarios

1. The simplest way is to call the Business Rules Engine from Inside a CodeActivity. Here, you would just call the Rule Engine in an in-process mode. This is just like any other method call.
2. If each of your Rulesets are exposed as specific Web Services, then you could use a InvokeWebService Activity, in combination with a WebServiceInputActivity and a WebServiceOutputActivity
3. Now, if you want certain Rules to be Applied on an External Event, like say, an Order Created Event, then you could use the HandleExternalEventActivity and a CallExternalMethodActivity.

The above are some of the most basic scenarios. These, in conjunction with other Activities in a Workflow should provide for common integration scenarios.

Related Posts

1. Windows Workflow Foundation & Business Rules