If you haven't read Don Norman's book, you should do it. It's called "The Psychology of Everyday Things" and it's a wonderful exploration of how to make product

If you haven't read Don Norman's book, you should do it. It's called "The Psychology of Everyday Things" and it's a wonderful exploration of how to make products easier to use (without sacrificing functionality). The examples are a bit dated since the book is from the 80s, but the concepts all still apply. My favorite quote is "It's a shame when something as simple as a door needs an instruction manual, even if it's only one word".