... Customer orders a book using the book’s ISBNActors: Customer, System Additional Use Cases Needed: “Complete Order” use case1. Customer locates the search field.2. Customer enters the ISBN into ... aspects of error tolerance. Some type of GOMS analysis can be con-ducted at almost any stage of system development, from design and allocation of function to prototype design, detailed design, and ... is to take your competitors’ designs, brand them with your logo, and ask people which design they like best for your site. If your own design is among them, then you can verify whether your design...