UI used to mean the totality of the user&#x27;s interaction with the tool, including things like usability, accessibility, learnability, and so on. After all, how can you possibly build a good UI <i>without</i> an awareness of these related topics?<p>Today, I think UX::UI as Agile::programming or Lean::startup.<p>That is, people who knew what they were doing did most or all of the things the buzzword implies before, and they had probably also a broad skill set that covered most of the useful areas implied by the modern buzzwords. However, a lot of other people feel the need to attach buzzwords or build silos to subdivide a field where they don&#x27;t have a comprehensive skill set, because of all the usual motivations.