The UServ Product Derby is an end-to-end scenario sample based on the UServ Product Derby Case Study used at the Business Rules Forum. In this sample, the WF Rules Engine is used to model the rules for some key scenarios in this case study and perform the processes in the company such as -

• Verification and approval of a new client application
• Determine the eligibility of a client to obtain vehicle insurance
• Determine the Premium for Vehicle Insurance

WF Rules Engine provides us many features due to which it makes a good choice for implementing such as application. We can separate the Business Logic from the process implementation details. The rules can be modified and used without having to recompile the application. The sample additionally demonstrates the following features of the WF Rules Engine -   

• How to use custom rule actions to execute other rule sets
• How to iterate over a collection using WF Rules using Forward Chaining.
• How to use WF rules outside of activities and workflows (known as "standalone" mode)