Compares factors required for a successful distance education course to requirements for designing a unit of instruction using instructional systems design (ISD). Application of these requirements to video teletraining is discussed to demonstrate that teaching ISD may be accomplished by teaching preservice teachers how to design a distance…

Discussion of search strategies in information retrieval systems focuses on the implementation of document ranking based on inverted files. Highlights include descriptions of three heuristic methods for implementing a weighting strategy and a comparison of two methods for estimating retrieval accuracy, including document movement and linear…