I took the thread class from Superior Threads and created that kind of book. For each thread, I would use stabilized fabric (I think I used two layers of muslin with batting). I drew a vertical line down the left side, marking into 1/2" increments. I'd label each 1/2" line with the tension from 0 to 8 with .2 increments. Then, I'd stitch 1/2", change the tension, stitch, change, stitch change. On the right side, I'd use what I felt was the optimum tension and play with different stitches. I've returned to use it several times already and have found it very helpful to have.