If you are an engineering student or an engineer in the industry you should know the equations that describe your design. Did you know that the variables that describe your system have tolerances ? You can get my app on google play and it can help you calculate yield of your design over tolerance space. It will work for Mechanical engineering, Electrical engineering or even Chemical engineering, except that you (or your professor in college) have to write the equations and the tolerances. Try my app and learn yield.