Just because the manufacturer says it is a 1/4" doesn't mean it isn't a tad off and as we all know that can really make a difference when pieces absolutely have to match up. I use the tape method and it works for me very well. The "scant" 1/4" seam drives me bonkers, exactly what is a "Scant?" Anyway I'm about to embark on a project that specifically states use a "scant 1/4" seam" and that if you don't the pattern won't work. Well that should make me put the pattern away, but I love a challenge and it is a gorgeous pattern so break out the chocolate and let the games begin.