This document discusses the importance and methods of ethnographic research for lean teams. It advocates conducting in-depth research by observing a small number of customers in their natural contexts to develop a deep understanding of their behaviors, experiences and perspectives. This helps teams move beyond assumptions to discover true customer needs and insights. The document outlines key principles of ethnographic research such as studying daily rituals and habits, asking open-ended questions, recording detailed observations and collaboratively analyzing findings to identify patterns and themes. It also provides an eight step process for ethnographic research and emphasizes the importance of context, holistic observation, active listening and mapping insights back to the original problem hypothesis.