I believe the primary job of a product designer is to drive behavior , not build functionality. You should be measuring your success in terms of the quality of the resulting behavior, not the quality of your deliverables.
In all the time I’ve spent watching people use the Web, the thing that has struck me most is the difference between how we think people use Web sites and how they actually use them. When we’re creating sites, we act as though people are going to pore over each page, reading all of our carefully crafted text, figuring out how we’ve organized things