Stakeholders generally provide plenty of design feedback. Sometimes it’s good, sometimes it’s not. Sometimes the feedback is so counter to a good user experience that you, as the UX designer, are compelled to take a stand. If you’ve been around for more than one project, you’ve probably done this already. Before your next encounter, you may want to read Winning a User Experience Debate, which is an excerpt from the book Undercover User Experience Design. They present a three-tiered approach for validating a design, which they call the Validation Stack. It walks one through the evidence that one can be used to defend a design decision. They also mention an additional technique to use when your use of the Validation Stack fails.