A pair of interactive computer-student dialogs developed for use primarily with elementary and high school teachers are described. The dialogs use graphic facilities for teaching about the sky as seen from the earth and about the phases of the moon. The primary aim is for the teachers to understand the nature of a scientific model, in this case…

With support from the National Science Foundation and the University of California, the Physics Computer Development Project have produced in the last six years computer based material in a wide variety of modes. Among the major products are science learning dialogs, graphic additions to APL (A Programming Language), the underlying software, and…