A short 2005 article by Kris Bruland describing how common errors are in historic weaving pattern books and manuscripts, based on her work producing more than 30,000 drafts for Handweaving.net. It classifies errors into four types (visual pattern errors, printing defects, repeat errors, compound errors), explains how she detects them by repeating and reducing patterns, and describes the custom drafting software she uses to correct them. The last pages give worked examples from Posselt, Donat and Yoshida, showing the original, the draft with errors and the corrected draft.