Although basing instruction on learning trajectories (LTs) is often recommended, there is little direct evidence regarding the premise of a LT approach--that instruction should be presented (only) one LT level beyond a child's present level. We evaluated this hypothesis in the domain of early shape composition. One group of preschoolers, who were…

The effects of teacher behaviors comprising lesson organization on student achievement were investigated in undergraduate students. Two instructional conditions were proper versus manipulated sequence and explicit organization behaviors present versus absent. Explicit organization had a significant effect on achievement. No significant…

A longitudinal research study in Israel was designed to investigate effects of mutual interrelations between courses in sequential teaching on long-term retention of learning in a science curriculum. The results implied that a program composed of a hierarchical sequence of learning units is superior to a discontinuous array of discrete courses.…