Research Request: Does Lean and/or Six Sigma (manufacturing) work for Service organizations?

Many people and organizations are talking about whether Lean and/or Six Sigma works for service companies. Some doubt that service can be treated as manufacturing and others say it can. The purpose of the research is to bring together peoples' experiences and discover the extent to which their experiences are the same or different. And more importantly, what is working or what is not . . . and why. The particpant commitment for this phase is a one hour interview over the phone, only participants will see the results of this phase in detail. Participants MUST be executives and managers of a service organizations (core process management preferred). If interested please reply to this post.