When 'product people' are good, they're what makes the product a success. When they're note good, they're worse than useless. My impression is that it's not an

When 'product people' are good, they're what makes the product a success. When they're note good, they're worse than useless. My impression is that it's not an aptitude you can learn from books. Being good at product design takes an ability to see the whole picture while also taking details seriously.