Studies of the hierarchical attainment of conservation of physics concepts revealed significant differences with respect to age, sex, and grade level in a random sample of seventh and eighth grade students. Conservation of a quantity did not necessarily depend on the prior conservation of its constituent fundamental quantities. (MLH)

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.…

It was the purpose of this study to design a secondary school curriculum in narrative and dramatic literature which would reflect the growth of structures of thought and behavior in early and middle adolescence. Based on Jean Piaget's theory of intellectual development which begins in the student's experiences and works toward…

Research was conducted to investigate the interactions among component processes of reading and to determine if a hierarchical training model, in which particular reading components are developed sequentially, is an effective way to build reading skills for a target population. Three game-like microcomputer training systems were constructed, each…