Secondary-level history teachers participated in a study examining differences among experts, experienced teachers, and novices in classroom use of higher order thinking skills (HOTS) and content knowledge. The results support the theory that development of teaching expertise is associated with a change from HOTS-lean and content-rich (curriculum-centered) practices to HOTS-rich and content-lean (learner-centered). (Contains 67 references and 5 tables.) (GCP)