professional activities.

The article presents information on the professional activities of the Association for Computing Machinery (ACM). Papers describing original research are sought for the Fifteenth ACM Symposium on Theory of Computing, which is scheduled to be held from April 25, 1983 to April 27, 1983 in Boston, Massachusetts. Typical, but not exclusive, topics of interest include: algorithms and data structures; automata and formal languages; computability; complexity theory, etc. A call for participation has been issued for the Tenth Annual Conference of the ACM's Special Interest Group on Computer Graphics, which is scheduled to be held from July 25, 1983 to July 29, 1983 in Detroit, Michigan. Submissions are invited for both technical program paper and panel sessions. Previously unpublished papers in all areas of computer graphics and interactive techniques are sought. Appropriate topics include display techniques; graphics software systems and languages; graphics hardware; robotics; and any applications of graphics. Video or film material that is an integral component of the work must accompany the paper.