Identify one of real-world problem, example “It is difficult to recruit good wait staff who provide the level of customer service to which we have become accustomed.” Then, analyze the problem space by answering some of questions such as What are the reasons of these problems?

Design a conceptual model for your addressed problem There are four basic activities for interactive design prototypes is the third phase, list out at least four issues relating to testing the prototype?

Explain the term User understanding, and list out at least four benefits for designers?

What is the difference between usability and accessibility, identify the usability issues?