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Interviewing
Customers
JobsToBeDone.org
ChristensenInstitute.org
strategyn.com
Surveying
Customers
SurveyMonkey.com
google.com/Forms
Eavesdropping
Target Audience
Customer Forums
Customer Groups – Linkedin/Facebook
Reviews – Amazon
Books
Value Proposition Design – Alexander Osterwalder
Jobs-to-be-Done The Handbook – Chris Spiek & Bob Moesta