“…Alternative design concepts are considered and evaluated based on compatibility with the user goals and objectives, as well as correspondence with guidelines and principles based in scientific evidence (Vu et al, 2012). Once a wire-frame or working prototype is available, heuristic analyses (the extent of conformance with design guidelines) and cognitive walkthroughs (evaluations based on actions that users are likely to perform when interacting with the product) are conducted by usability specialists to ensure that the product does not violate known design principles and standards.…”