This lecture looks at the touch points (get it?) we as creators have with our users and their mobile devices. The talk covers new mediums we get to play with and how old ones have changed. There will be a strong emphasis on usability principles and how designing an experience should be applied at all stages of creation and then after it is in the wild. We go through documents a dedicated ux designer would create and a slew of examples including search, onboarding, forms, notifications, offline, menus and error states.