In this course you will learn how to use video data for prototyping. The course provides hands-on training in working with video clips, including transcription and identifcation of relevant actions. You will familiarize with core interaction analytic concepts (grounded in ethnomethodology and conversation analysis) and will learn how to do an action-by-action analysis. Working on the design case of everyday interaction with automatic doors, you will learn how video interaction analysis can be embedded in an iterative design process.