Quite interesting. As a developer, one thing that has frustrated me to no end is product managers not interacting enough with the developers. In my corporate career, I have seen too many of them talking abstractly about the product and hoping that the developers will magically figure out what needs to be done. After handing over a sketchy PRD, the job is done. " Drafting functional specs that range from whiteboard drawings to many-paged docs describing how things will work (totally depends on your ability to communicate, the team you work with, etc)" - This is so important.