What do engineers know about the actual use of the products they design?  What do they know about the customer users’ interactions and experiences with products?  Are use instructions clear, intuitive and coherent?  What about use environment:  is it current? What about user error? What is the use space: where new products really used, how used?  Safety, reliability, ergonomics, efficient use, risks, and more. Does the design engineer assume he or she is the User?   Steve Zielinski answers these questions and presents a robust understanding of customers’ USABILITY interests; he includes all aspects that the design engineer must know and address.  Avoid the risk that your engineers do not know all usability elements.  Steve Zielinski provides you a with visuals your engineers can use with your customers.