We conducted extensive meetings to deeply understand our target audience: behavioral therapists who work directly with children with autism. These therapists engage in one-on-one sessions, teaching essential skills for the children’s development. Initially, we focused on their daily interactions, but our research revealed various factors affecting their device usage, particularly the importance of data books. Each data book contains 20 to 30 data sheets, where therapists meticulously record session details. These insights are crucial in guiding our design process to effectively meet their diverse needs.