A bit OT, yet relevant to the topic of accuracy in woodworking.
The Architectural Woodwork Institute publishes standards for the millwork industry.
They inspect, test and certify millwork companies capable of meeting AWI Quality Standards.
Quality oriented millwork companies typically hold AWI certification(s), under which they produce millwork meeting one of three AWI standards; Premium, Custom, Economy.
Fractional dimensions do appear in the text of AWI Standards.
But the actual tolerances of AWI Quality Standards are stated decimal inches and mm.
AWI — Home - AWI Communities
