Content-UX mapping aligns the content of an interface (labels, headings, instructions, empty states, error messages, tooltips) with the user's mental model and decision-making process at each interaction point. It recognises that in most digital products, the words are the experience: every label is a wayfinding sign, every instruction is a cognitive prompt, and every error message is a moment of truth. Mapping content to the user flow before writing a single line of copy prevents the most common and costly UX writing failure, correct words in the wrong place.