Effective, nurturing, and responsive teaching practices and interactions are key for all learning in early childhood settings. They foster trust and emotional security; are communication and language rich; and promote critical thinking and problem-solving. They also support social, emotional, behavioral, and language development; provide supportive feedback for learning; and motivate continued effort. Teaching practices and interactions are responsive to and build on each child’s pattern of development and learning. They can be measured by the Classroom Assessment Scoring System (CLASS^®) and other adult-child interaction tools. These observations may then be used to support professional development. Teaching practices also include how schedules and routines are carried out, how settings are managed, and how children’s challenging behaviors are addressed.