A review of research findings on context variables in the classroom and their effects on student achievement provided a framework upon which to base conclusions on the following factors pertaining to effective teaching: (1) teacher control of the classroom; (2) adjustment of teacher control of learning activities to student abilities; (3) relationship between control of learning tasks and achievement outcomes; (4) implications of positive affect in the classroom environment; (5) relationship of teacher praise to student achievement; (6) effect of rewards on student performances; (7) relationship between negative affect and student socioeconomic status; (8) relationship between level of task structure and student socioeconomic status; (9) relationship between level of task structure and student cognitive level; and (10) relationships among time on task, student cognitive level, and socioeconomic status. (JD)