Narayan Devanathan from Wipro has this short whitepaper on BRMS and Business Users. It is an interesting read on.

He draws this conclusion in his paper

Implementing a BPM/BRMS system is not merely an application change. It is a change in the way that an organization works.
While it is not as complex as a re-engineering exercise (BPR), organizations use this time to standardize the rules, evaluate the rules present and decide which of these rules to retain etc.
Any change in the way that the organization works results in resistance from people. When implementing these systems, time for training users should also be included.

These are topics I have blogged about before, so I wont go further. I have written about Business Rules & Maintenance and Business Rules for the Analyst and about How a BRMS Promotes Collaboration.