the teacher’s classroom plans and organization, sensitivity and responsiveness to all the children, and moment-to-moment interact-tions with them that have the greatest impact on children’s development and learning. The way teachers design learning experiences, how they engage children and respond to them, how they adapt their teaching and interactions to children’s background, the feedback they give-these matter greatly in children’s learning. And none can be fully determined in advance and laid out in a curriculum product or sen of lesson plans that every teacher is to follow without deviation. Teachers will always have moment-to-moment decisions to make.