The purpose of this collective case study is to explore the practical significance of digital video-based observation in the classroom. Data from four case studies using digital video observation are presented. In the first study, video was used to conduct a systematic observation of children`s emotional expressions. In the second study, toddlers` short-term interaction and action was recorded to understand peer interaction development. In the third study, teachers collaborated with researchers in a video-based mentoring program that provided rich video data for participating teachers. The last study used video data to study children`s use of space and the teacher`s supervision system. This research provides practical directions for digital video in the classroom.