In the transmission section of this book, the process of selecting the type of rack and pinion system was covered. Also in the same section were discussions regarding both lead and ball screws. In this addendum, a detailed process as to the selection of the best ball screw for you to choose and use is presented. Please note that although this selection process is specific to those of ball screws, there is also a similar engineering guide available through Thomson Linear for lead screws and their regular and anti-backlash nuts (see www.thomsonlinear.com). Special credit for the following ball screw product selection overview goes to Thomson Industries, Inc.