Enumerates principal management objectives of database management systems (data independence, quality, security, multiuser access, central control) and criteria for comparison (response time, size, flexibility, other features). Conventional database management systems, relational databases, and database machines used for backend processing are…

The scaffolding metaphor was originally developed to describe the support given by a more expert individual in a one-on-one interaction. Since then, the notion of scaffolding has been applied more broadly, and it has been transformed and generalized. Most recently, it has been used by researchers in the learning sciences to describe features and…

Discusses major features and capabilities of gateway software--microcomputer software packages that act as interfaces between users and bibliographic retrieval systems they are searching--i.e., communication, interface, auxiliary programs. Four programs (In-Search, Universal Online Searcher, Search Helper, microDisclosure) are reviewed and…

This theme issue provides brief descriptions or reviews of specific authoring tools including the Digital, TenCORE, EASE, Courseware (Apple), and PLATO authoring systems. Articles on conceptual or practical issues emerging from extensive experience in specific settings or based on use of specific authoring systems are also presented. (MBR)

This book discusses constructing variables and making measures. It begins by outlining the qualities a number must meet before it qualifies as a measure of something. The basis is the measurement philosophy of G. Rasch. The first requirement for making good measures is good raw material. To achieve the possibility of comparisons, the data must…

Presents results from the 1992 Drug Use Forecasting (DUF) program that measures illicit drug use among persons arrested for criminal behavior. Adult use of specific drugs, male juvenile drug use, and the role of the DUF are explored. (GLR)