I have always wondered why certain aspects of quality.... especially when it pertains to dimensional inspection, has always been to document the actual dimensions... formally and sometimes informally to provide objectionable evidence even if there is no traceability of part and its dimension or no control over variables that can effect the actual dimension. I was wondering if you know of books/articles that deal with this and when its appropriate to document dimensions or not... We spend a huge amount of time and effort documenting dimensions when they are not even traceable back to the part once separated. I completely agree with documenting when doing statistics for trending... gage r&r.. capabilities.. etc. etc. but when this day and age of CNC capabilities are near perfect on proven programs/ tooling ,etc. and we are only running one and two parts (very low production) at anytime..... with no traceability requirements.... why would there be a need to record dimensional data.... ? and how would I explain this to management as to eliminate wasteful practices. We currently use stamps for acceptance/ rejection... so why would a work auth document with a stamp not satisfy objectionable evidence... It just seems there is a better way to perform metrology beyond writing down dimensions... would have been talked about by now. Considering all the variables with operators... equipment, environment, etc. etc. why would someone even attempt to use that data for a root cause investigation? With measurement uncertainty... it can be assumed the product was acceptable to a high degree of certainty but an actual number is not very helpful considering the low volume of production. It seems.... the days of manual machine created a need to document dimensions and the quality world/ environment has never moved away from that thinking even though technology has created many situations where it is not even needed.... just a CofC or stamp will do. look at CT scanning capabilities now days... don't even need to measure individual parts... can check an entire assembly to CAD with no need to actually document a dimension. Just wondering if anyone... an article... etc has touch on this and gone into depth as to why certain situations need actual dimensions documented... what good they are... and the supporting requirements that make this all make sense. All dimensions inside of the budgeted tolerance should maintain fit, form and function. If a failure happens... it can not be a dimensional error... from inspection... maybe a design error in the dimension but if the product is in tolerance per print.. the root cause is in design... not in the actual measurement. Thanks for any input.... Sorry for the all over the place..... there is just so much to this topic... and so many scenarios... hard to express the areas of concern without jumping around.