The document discusses various methods for validating assumptions made during customer development, such as demand testing using landing pages, email campaigns, blogs, and ads. It recommends tools for demand testing like Unbounce, LaunchRock, and Google AdWords, as well as for prototyping like Axure, Balsamiq, and Omnigraffle. Some tips provided include that everything learned during customer development is an assumption, testing the riskiest assumptions first, building the right tool for the type of test, and asking questions.
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