A Minnesota Weaver swatch page by Joy Rosner explaining the warp pattern system, in which extra supplementary warp threads form patterns over a tabby foundation on looms with three or more harnesses. It covers threading (two 4-shaft alternatives), sleying, tie-up and treadling, and ways to manage tension between the two warps, including double beams and hanging weights on warp chains. It ends with a bibliography, a postscript on the M's and O's name reversal from a Handweaver and Craftsman article, and an erratum for a Waffle Weave swatch page.