TypeBookAdded inBooksAuthorDan HeathCategoryProduct discoveryProblem understandingCommentsURLhttps://www.amazon.de/-/en/Dan-Heath/dp/1787632741/ref=sr_1_1?crid=18TW3V7KOHJ9I&keywords=upstream+heath&qid=1691703921&sprefix=upstream+heath%252Caps%252C125&sr=8-1&_encoding=UTF8&tag=kgiamalis-21&linkCode=ur2&linkId=c46d1562e5dc737c6dc90cfe262142f5&camp=1638&creative=6742