Fourth and final lesson in a series on analyzing woven fabrics, from the Master Weaver newsletter. It explains a two-step method for large patterns: first analyze a small sample to identify the weave, then reduce the pattern to a profile draft, short tie-up, and short treadling draft. A worked example of a two-block fabric that resembles Crackle turns out to be Summer-and-Winter woven Crackle-style, and the full threading and treadling are reconstructed from the profile.