This document outlines various methods for validating startup and product ideas, including market validation, problem validation, product-market fit validation, feature validation, onboarding validation, business model validation, and growth model validation. It discusses using tools like surveys, interviews, wait lists, ads, and metrics like customer acquisition cost to determine if there is a problem, a solution, and a viable business model. The document also provides examples of famous startups that underwent pivots or grew rapidly after validation.
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