One hundred ten secondary school chemistry students were given two tests after programed instruction. Researcher concludes from comparison of results that there was a significant difference between the two tests. The experimental test, based on Bloom's Taxonomy, discriminated between higher and lower cognitive levels and categories. (JM)

A program called PROBLEM is detailed. It is a framework program built around a module structure that helps to make the development of computer-supervised drill much more manageable. It is viewed as an efficient approach in substantial areas of instruction in science and engineering. The material is entirely written in BASIC. (MP)

Discusses the nature and applications of mass-selective laser photoionization. The ionization can be done with a single intense laser pulse lasting a few billionths of a second with no molecular fragmentation. Applications focus on: (1) benzene clusters, excimers, and exciplexes; (2) metal clusters; and (3) triplet formation and decay. (Author/JN)

Taking a prototype chemical reaction (molecular hydrogen plus hydrogen atom), constructs an accurate semiempirical, generalized diatomics-in-molecules potential energy surface, calculates motions of these atoms on this surface using REACTS trajectory program, and presents results as moving picture on a microcomputer graphics system. Provides…