Presents evidence that three distinct modes of performance can be identified in biology: analytic, constructive, and the practical. Describes a form of practical test in a laboratory setting that measures the practical mode, which cannot be measured by paper-and-pencil tests. (AL)

Lists some advantages of including science history in secondary school courses. (AL)

Analyzes how advanced level secondary school physics examinations are changing and by looking at the nature of this change, extrapolates into the future. (Author/PR)

Short articles describe techniques suitable for junior high school science, including the construction of a night dial,'' an instrument developed in the sixteenth century for telling the time from the stars; a method of producing microphotographs, and a method of conceiving of weightlessness. (AL)

Distinguishes between Computer Extended Teaching (using computers as aids), Computer Assisted Teaching (using computers as an integral part of the instruction) and Computer Based Teaching (the computer-student dialogue is the major component of instruction). (AL)

Suggests suitable species of microscopic green algae for demonstrating diversity of form, increasing complexity in related species, the animal" and plant" characteristics of protists, and protist behavior. (AL)

A practical application of a physical law in the repair of a garage door. (CP)

Describes a teaching procedure designed to show that there is a logical, predictable arrangement (of climates) that results from the actions and effects of a few global climatic controls." An hypothetical continent is used to develop these principles which are then applied to real situations. (AL)