Recently, I participated in a certification seminar in Chicago on exterior insulation finish systems. This seminar was developed by the Association of the Walls and Ceilings Industry to provide education for plastering mechanics, industry professionals and inspectors. Having gone into this adventure thinking I could probably teach the course, frankly I was surprised at the intensity of the two-day instruction that was capped by a 135-question test, with a mandatory passing rate of 86 percent.