“…We used iterative design process. Based on the insights from our previous work on production tools for television broadcasting [8,9,13], literature reviews of the streaming tutorials (e.g., [2,7,10,11,19]), and the on-going research in designing user interface for video applications [16,17]. We came up with four initial designs (A -D), which share some common features, and all have its own unique features (mainly about how to create, organize, and preview objects).…”