Workshop notes explaining how to develop twill structures in both layers of double weave on 8 or more shafts. They cover the straight-draw threading with dark and light warps, the tieup and peg plan for 2/2 twill, and how the bottom layer is drawn when viewed from below. Further examples change the treadling order or peg plan (including 3/1 and 1/3 twill) to produce color-and-weave effects, and the notes end with a 12-shaft window design with plain weave or twill backgrounds and borders.