This document provides a crash course in customer journey mapping for lean thinkers. It discusses mapping customer journeys from the customer's perspective to identify problem areas and opportunities. It recommends starting with assumptions, asking "why" 5 times to understand the problem better, creating empathy maps, and reframing the problem from the customer's point of view before ideating, prototyping and testing solutions. Tips are given like identifying a specific customer type, keeping the process collaborative, using the appropriate level of detail, and mapping both the visible and invisible aspects of the customer experience. The goal is to redesign experiences to influence customer attitudes and behaviors. Resources for further learning are also provided.