While production methods were constantly improved over time, the basic methodology remained the same for the first 30 years before the introduction of desktop publishing. Because most of the work shown in the magazine had been previously printed and could not be cropped, layouts had to be extremely accurate. Many featured pro­jects had type or other elements close to the edges and after a 60–75 percent reduction, tolerances became very tight. Artwork was measured and reductions were calculated on enlarged reduction wheels recalibrated for accuracy.