INSTRUCTIONAL MATERIALS. Margaret E. Kastner, Department of Chemistry, Bucknell University, Lewisburg, PA 17837.

Computer aided instruction can be used either by students in independent study or as guided work by the instructor in lectures or computer laboratories. Crystallographic CourseWare is a series of HyperCard stacks describing crystal growth techniques, interpretation of precession photographs, descriptions of symmetry elements, identifying the symmetry, unit cell and asymmetric unit in plane groups, and interpreting the diagrams in the International Tables for Crystallography, Vol. A. Animations are used to sequentially focus attention on particular features. Numerous examples provide the student with practice.

The exercises in plane group symmetry present a pattern and with a few clicks of the mouse the student can place the symbols for the symmetry elements in appropriate positions on the pattern, outline the unit cell, and outline the asymmetric unit. Answers are immediately available, some with animations or further details.

The exercises for reading Volume A present either the crystal coordinates, the symmetry projection diagram or the general position diagram and a template on which the student places symbols of the symmetry elements or general positions. Several exercises have answers immediately available, other answers can be found in the Teaching Edition of Volume A and a few are only found in Volume A.

Short videotapes can be used to provide an overview of the process by which single crystals yield structural information or provide detailed instruction on how to take precession photographs.

Availability and formats for the current programs and plans for updating or expanding them will be shared.