"Telesecundaria" has for the past six years attempted to provide secondary education (grades 7-9) by television to those students who would normally not be able to continue their education beyond the primary level. The study reported here aimed to evaluate the system, especially its cost-effectiveness, suggest strategies for improvement,…

Intended for supplementary use with "A Reference Unit on the Meaning and Importance of Agribusiness," this suggested teaching plan is designed to assist in teaching certain fundamental concepts associated with the meaning and importance of agribusiness. It is composed of the following sections: Purpose, behavioral objectives, situation,…

The author describes a secondary level course in which students make their own audiovisual productions to illustrate social studies issues. (DE)

Describes ways that orbiting satellites carrying amateur radios can be used in the classroom at various grade levels to supplement physics, mathematics, electronics, and social science curricula. (MLH)

Advocates the use of elementary science materials in teaching three-dimensional geology concepts. Elementary science materials from six sources are analyzed for uses in geological considerations. (CP)

Provides a computer program in BASIC language by which a least squares approximation of a straight line may be determined. (CP)

Describes the operation of the computer program and a sample print-out is provided. (CP)

Callus induction from species of Haworthia can be done quickly in the laboratory with minimal equipment to study tissue dedifferentiation and cellular redifferentiation. It is shown that the cultured cell can also be used to study and evaluate the effects of various mutagens, carcinogens, and pesticides in controlled environments. (Author/MA)

Provided is an annotated listing of sound filmstrip programs and 16mm films for teaching social studies at the intermediate and secondary levels. Specific topics include money; interest rates; disarmament; and the legislative, executive, and judicial branches of the US government. (RM)

Describes how to construct models of contour lines from flexible, colored bell wire. These models are used to illustrate three-dimensional terrain characteristics represented by contour lines printed on a flat map. (MLH)

An overview of the development of computer assisted instruction in Great Britain. (HB)

Described is a study that confirms positive effects on student achievement of manipulation of molecular models by high school chemistry students over a long period of time. Also examined but unanswered were questions regarding applications of Piaget's theories in determining differential effects for concrete and formal operational students. (CS)

Describes four basic methods for developing aural comprhension, namely, guided and independent comprehension of details and of the whole. For each of these, appropriate classroom procedures are described, with examples. Suggestions are given for the teacher for preparing his/her own taped texts. (IFS/WGA)

Discusses the methodology used in the Models of Media Education research projects which examined media teaching styles of a group of secondary English teachers in the United Kingdom. Offers conclusions about the teachers' aims and focal concepts in their lessons. Considers the extent to which curriculum innovation involves pedagogical change and…

A study of 22 high school students who used a prototype navigational map for browsing hypermedia documents found that the tool was not effective. Supporting previous research the study found the use of maps resulted in poorer performance, less use of the system, lower perceived control, and poorer development of mental representations. (PEN)