Lean UX Framework A practice-driven approach to UX that replaces heavy deliverables with rapid experimentation, cross-functional collaboration, and continuous learning. Lean UX shifts the question from "What should we design?" to "What do we need to learn?" Core Principle Outcomes over outputs. The value of a design is measured not by the fidelity of the deliverable but by the change in user behavior it produces. The foundation: Traditional UX waterfalls requirements into wireframes, mockups, specs, and code—losing context and hiding untested assumptions at every handoff. Lean UX compresses t…