Phase II provides a more detailed examination of classroom variables important to achievement in Oklahoma schools. Where Phase I addressed all nine of the Oklahoma essential elements using survey data, Phase II focuses on what occurs in Oklahoma classrooms primarily using data from principal interviews, classroom observations (on-site), and video recording observations. Teacher data is anonymous and video recordings of teachers were viewed only by MRL researchers involved in the study. (Contains 22 figures and 1 technical note.) [For "What Works in Oklahoma Schools: A Comprehensive Needs Assessment of Oklahoma Schools. Phase I State Report," see ED539803.]