Models which demonstrate the concept of moment of force in two- and three-dimensional cases and have been well received by students are described. Photographs and instructions for each model are provided. (MVL)

Reports on the assessment of student thinking in the area of commitment to the laws of conservation of matter and energy during a study of conceptual change among introductory chemistry students. States four conditions upon which strategies for conceptual change are based. (RT)

Addresses whether or not science laboratory activities should become a thing of the past. Discusses the impact of the curriculum reforms of the 1960s and 1970s, physical restraints which cause teacher overload, rationale, and objectives of laboratory work. (RT)

Describes one successful secondary science model involving a child-centered plan of instruction that uses several nontest evaluation and documentation strategies to verify mastery of essential elements. (MS)

Discusses three areas of catalysis: homegeneous, heterogeneous, and enzymatic. Explains fundamentals and economic impact of catalysis. Lists and discusses common industrial catalysts. Provides a list of 107 references. (MVL)

Discusses the problems of grading an organic laboratory course. Proposes that the grade should be based as: products--30 percent of the grade; notebooks--30 percent of the grade; exams and final report--40 percent of the grade. Gives an exception policy for special considerations. (MVL)

Describes two demonstrations: 1) the effect of polarity on solubility using sodium dichromate, TTE, ligroin, and water to form nonpolar-polar-nonpolar layers with the polar layer being colored; 2) determination of egg whites to be yellow by determining the content of yellow colored riboflavin in the egg white. (MVL)

States that students have misconceptions about the principles of mechanics internationally providing examples and two problems. Describes Nachtigall's program to train teachers and reports its application to classroom teaching. (YP)

Examines the interaction between mode of computer assisted instruction and cognitive style on the understanding of concept relationships and mastery of factual information. Finds learners are more effective when matched to the appropriate mode of computer assisted instruction. (MVL)

Recounts events leading to the existence of an organization for biology teachers. Cites data on the status of biology teaching in the United States. States that the association has been concerned with accuracy of course content, facilities, curriculum, instruction, and teacher preparation. (RT)

Examines the change and general view of methods in biological science and the possible consequences for biology education. States that the transition was from descriptive biology to theoretical biology. Lists the postulates of some theories. (RT)

Describes an engineering course for graduate study in random media. Summarizes random media as bulk properties of ordered and disordered two-phase materials. Gives course outline for one semester. Topics include: disordered systems, microstructure determination, survey of models, connectivity, and effective properties. (MVL)

Results of an experimental study involving 49 sixth-grade science students suggest that teacher-constructed graphic organizers, regardless of position (before or after textual reading), are no more effective than traditional instruction in increasing comprehension and retention of science content-area information. (IAH)

Discusses a research project that uses artificial intelligence techniques to help teach programing. Describes principles and implementation of the LISP Intelligent Tutoring System (LISPITS). Explains how the artificial intelligence technique was developed and possible future research. (MVL)

Discusses the implementation of a software system that allows teachers to take advantage of large banks of questions in subject areas. Explains that this plan is the result of a 1981 court mandate to standardize learning outcomes. Follows the development of the system and choosing of the software. (MVL)