For Project 4, our set of keys offered some security settings that may frustrate some users if they were unsure how to modify or properly use them. Our device was operated by a touchscreen. After reading Chapter 5, I believe offering tips in the form of a question mark icon would be the best solution. This would make it clear and simple for a user to touch the icon which would bring up tips and hints. These would be concise but very helpful in explaining how the device operates.
By the way, this book isn't too bad. I usually find myself reading for this class before I do my others because it is easier to follow along and stay awake.
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