As a programmer I find that a very useful set of rules for my daily work is the Zen of Python, a set of basic guidelines that helped me to develop a sense of taste and that became the foundation for more specific rules I try to apply.
Is there a similar set of rules (or "commandments") you find yourself frequently coming back to in regards to User Experience Design?
[EDIT] I was hoping find a set of concise, simple and possibly controversial guidelines, that may serve as a starting point for a conversation about UX Design in my organization. Something I can print out and pin to the board beside the coffee machine. Maybe Dogme 95 is a better example than the Zen of Python.