Ir is always wise to plan for some flexibility. There are so many things that can cause you to alter cutting plans. Recently I had a fabric that had an obvious portion that needed to be centered in the strips I cut. In other words I could not just cut the strips one after another if I wanted this feature, Thus I had to cut along the design elements and then cut away about 3/4 inch from the strip to get the design centered. It looked so nice in the quilt but it was just a little wasteful. I was glad I had purchased extra fabric. There are so many things to be mindful of in the planning stage.