If you’re making something, selling something, trying to reach people you have to be able to answer this question. It is shocking how many entrepreneurs, writers, salesman, even politicians never bother to stop and go: Who the hell is my audience here?
As Don Norman — known for coining the term “UX” — said it best, “The real problem with the interface is that it is an interface. Interfaces get in the way. I don’t want to focus my energies on an interface. I want to focus on the job.”