Brant... I think that what they mean is that your phototooling, assuming that you are not suppling Gerber data files, will have inherent toler- ances based on the photoplotting hardware. The Gerber database has no real tolerance associated with it, unless you want to be picky and are concerned whether the dimensions in you software package are outputted as three or four decimal places--then get a life. Your design should be dictated by the end product requirement in association with the impact by your vendor's manufacturing tolerances. If you would like to discuss this futher, please contact me. Bob Vanech (203) 852-4810 E-Mail: [log in to unmask]