Together with my Zühlke team we designed the holoRepair app for Jungheinrich. Mixed reality challenged our development, but pushed our knowledge about this new promising technology. The slides display our five categories of challenging aspects: - Display (the reality), - Sight of view (how to deal with a small sight of view), - Orientation (user guidance, pathfinding and notification), - Interaction (air tap, movement and voice), - UI-patterns (use existing and create new one). Furthermore there are two slides that explain the setup of a the prototyping method, called "Wizard of Oz". These slides were presented at the UXCamp Europe 2017 #uxce17 in Berlin - they supported my talk. Ask me, if you want to get details about the different categories. - @ixlonxy