Teachstone focuses on enhancing the quality of education by improving the interactions between teachers and students. Established in 2008, the organization is known for the Classroom Assessment Scoring System (CLASS), a research-based observation tool that measures the effectiveness of teacher-student interactions and their impact on learning. Teachstone provides professional development services and resources designed to support educators in refining these interactions, ultimately fostering better educational outcomes. Through its online platform, myTeachstone, the organization simplifies the implementation of CLASS, offering a comprehensive library of resources that aid in teacher training and classroom observation. Teachstone's mission centers on transforming education nationwide by equipping educators with the tools and knowledge they need to create nurturing and effective learning environments for children.