I am currenctly working on Judy Niemeyer's double wedding ring that has a lot of paper pieced curves. When you actually sew the pieces together, you take the foundation piecing off one of the parts that you are sewing together. I have done a couple of the curves, and I did not have a problem. I do have to say with this pattern I probably have at least fifty more to do, but so far it has not been a problem.