@Kymberly I *count* by 10/12 but most of my books suggest *crossing* single threads and I do. I use a warping paddle to save time when measuring hundreds of threads, and in that case I cross after however many threads are in the paddle. If you look closely at my picture of the lease sticks, you will see I'm crossing every 2 threads because I measured the yellow and brown threads on the warping board at the same time.