Customer Discovery Systematically validate your business hypotheses before building anything. Master Steve Blank's Customer Development methodology that became the foundation of Lean Startup and YC's approach. When to Use This Skill - Starting a new venture to avoid building something nobody wants - Before writing a line of code to validate problem-solution fit - Pivoting decisions to systematically test new directions - Early-stage fundraising to prove market validation - Product roadmap planning to prioritize based on validated customer needs - Entering new markets to understand unfamiliar…