This document provides tips and guidance for effective customer interviewing. It outlines exercises for participants to practice interviewing skills in small groups where one person is the speaker, one the interviewer, and one the observer. The exercises focus on practicing open-ended questions, active listening, using silence and body language effectively, and gaining insights rather than just information. Reflection after each exercise allows participants to improve. The goal is to learn directly from customers rather than make assumptions, in order to deeply understand their needs and build products they want.