The ECERS-R is an observation tool used to assess the quality of preschool classrooms. It contains 43 items organized into 7 subscales that evaluate different aspects of the classroom environment and teacher-child interactions. The document provides an overview of each subscale and the items included. It also includes tips and examples for scoring items on the scale regarding aspects like dramatic play, child displays, language use, and accessibility of materials. Video clips demonstrate using the tool to observe and score items in the classroom.