The size, cost, and complexity of quantitative modeling in the social and physical sciences demand that modelers focus attention on premodeling phases of analysis, specifically on formulation and definition of problems. This is especially true in the areas of futures research and technology assessment. At the problem-defining stage of modeling, a…

Telidon, which consists of two computerized communications systems for displaying text and graphics on a television screen under user control, is being field tested in the libraries of two York Region Board of Education (YRBE) schools in Aurora, Ontario. Beginning in spring 1983, students were able to access, via telephone, a computerized data…