Theresa Stack is an Occupational Safety and Heath Consultant and Instructor for the Montana Department of Labor and Industries. She is a Certified Professional Ergonomist and a Certified Safety Professional with over twenty-seven years of professional hands-on experience at the publishing of this text. Theresa also supports universities, providing instruction and conducting scientific research with a primary focus on ergonomics, objective workplace evaluation, OSHA compliance and hand tool design. Prior to joining the DLI, she provided consultation program management support as the Department of the Navy’s Senior Occupational Ergonomist for fifteen years and spent nine years as a tenured professor. Theresa continues to instruct for various universities and provide subject matter expert consultation for their shared company Solutions 4 Work LLC. Lee T. Ostrom is Professor Emeritus and was previously Center Executive Officer at Idaho Falls Center and full Professor in the College of Engineering. His doctorate is in industrial engineering from Texas Tech University in 1988. He worked eleven years for the Idaho National Laboratory in the Human Factors Group and came to the University of Idaho full-time in 2000. He has over forty years of experience in egonomics, human factors, and safety and health. He has authored or co-authored four books and numerous book chapters and articles.