When I was working on my masters degree project I thought I created a pretty good UI. At least I couldn’t think of a way to make it better. Then I did a 1 on 1

When I was working on my masters degree project I thought I created a pretty good UI. At least I couldn’t think of a way to make it better. Then I did a 1 on 1 evaluation with a user who knew nothing about the subject matter. She had some recommendations that significantly improved the UI. I changed the UI and then I did a 1 on 1 evaluation with a knowledgeable user. He had more recommendations. I implemented them and then did a small group evaluation and then a large group evaluation. At each step suggestions were made that greatly enhanced the UI. By the time I was finished the UI was much different than what I came up with on my own, but tremendously improved to my great astonishment.