User research and what you see is not what you get.
“User research consists of two core activities: observing and interviewing. Since we’re most interested in people’s behavior, observing is the most important of these activities because it provides the most accurate information about people, their tasks, and their needs. While interviewing is also very important, the information people provide during interviews isn’t always accurate or reliable. Often, research participants don’t know why they do things, what they really need, what they might do in the future, or how a design could be improved. To really understand what people do, you can’t just ask them, you have to observe them.”