The authors employed the Raven Test of Logical Operations (RTLO) to assess development of cognitive structure for subjects of ages 8 to 19. Their conclusions support in part the development sequence described by Piaget. Lack of hierarchical order in some cognitive operations may indicate limitation of the instrument. (Author/EB)

Discusses five instructional strategies for increasing the meaningfulness of technical or scientific information. These include organization of prose, use of concrete analogies as advance organizers, use of inserted questions in prose, elaboration activities such as note-taking and discovery learning. (JN)