This paper provides psychological and sociological substance to Kurt Lewin's conceptions of topological territories. (Author/AM)

Describes a physics experiment in single and multiple slit diffraction and interference phenomena that illustrates the existence of diffraction gratings in many common objects. (MLH)

The universities and institutions that deal with undergraduate education generally have a traditional organizational structure: their human resources are allocated to departments which are structured on subjects, and the persons are grouped according to their specialization profile. As a result of this, it has been observed that many groups are…

Behavioral objectives with minimum performance levels and illustrations are presented. The objectives are suggested on the basis of two arguments: first, they provide a basis for selection of laboratory content; second, they are stated in currently acceptable form. (DF)

Describes sequence of activities for teaching three-point linkage concept and gene-mapping to high school biology students. Includes laboratory experiments and hypothetical examples for classroom discussion. (PS)