Hi Robert, Geez, thanks to you and a few others, my ppd (postings per day) rate is skyrocketing! I appreciate your points. Indeed, if used as a trademark, NLPapplications could provide a useful distinction between content and process models. Speaking of which, could you provide an example of a model that you consider to be content? How do you define a content model? What about a process model? The more we talk about it, the less I feel I have accurate command of those concepts... Rock on! Martin