Agreed. There's nothing like being in the field with real users. Ideally, you don't just talk to them. You watch them work. Observe, and gather clues about

Agreed. There's nothing like being in the field with real users. Ideally, you don't just talk to them. You watch them work. Observe, and gather clues about what will serve their needs. And when people tell you what they think they want, don't assume that's the product spec; treat that also as an opportunity to listen to clues that will help you understand their needs. The best products are designed around how people work, not necessarily what people say about how they work.