The present study reports on the development of a questionnaire that evaluates children's experiences of their physical classroom environment, activities and interactions. It also explores the psychometric properties of the questionnaire and how acoustical characteristics of the classroom, class size and student characteristics (age, sex and Swedish as a second language) influence the self-reported outcomes. After development, the questionnaire name should read Activities and Interactions in the Classroom were administered to 101 students (7.9-10.7 years old). Demographic information about the students was collected from parents. The psychometric properties including test-retest reliability are good but can be improved by reducing the number of items. Acoustical characteristics of the classrooms and student characteristics did not predict questionnaire outcomes. As the acoustical conditions in students' classrooms were close to optimal, communication fostering support should be in focus. The present questionnaire can be used to assess young students' experiences of their classroom environment and learning situations.