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Four linked grids specifying threading, tie-up, treadling and the resulting cloth.
Also known as: Weaving pattern draft, Threading draft, Loom draft
A weaving draft is a diagram in four parts. The threading grid says which shaft each warp thread passes through; the tie-up says which shafts each treadle lifts; the treadling says the order the treadles are pressed; and the drawdown shows the resulting cloth. The drawdown is not drawn by the designer — it follows from the other three, and can be computed from them — which is why changing one square in the tie-up changes the whole pattern.
Four ruled grids arranged in an L, their squares filled or left blank, each grid aligned with the rows or columns of the one beside it.
Both are written specifications a weaver works from.