I wouldn't say that we are using data mining techniques yet, but have begun using regression analysis to identify causes for defective products. Process data is queried by part number, production unit, shift, you name it and then compared with the scrap for the same time frames. If I've learned anything, it's that regression analysis isn't enough. The data is stored in multiple databases and pulled into an ms access back end. From there vb.net does the rest. Does anyone have a suggestion for my next step. The users of the system like what they see, but the results aren't there yet. I keep wondering how inaccurate some of the data is and plan to do some design of experiments to better understand process variablity and measurement accuracy. I really need a system that can handle data that may not be perfectly accurate. Any advice would be well received. Thanks in advance, Fred