Presents a tested hypothesis raised by an earlier study and confirmed that query-surrogate documents chosen from within dense interdocument structures in scaled and visualized TREC Topic document data sets increased the number of relevant documents retrieved by 26-46%. Performance of information retrieval systems on data sets for which relevant…

An online library catalog was used to evaluate an interactive query expansion facility based on relevance feedback for the Okapi, probabilistic, term weighting, retrieval system. A graphical user interface allowed searchers to select candidate terms extracted from relevant retrieved items to reformulate queries. Results suggested that the…

This document presents a theoretical approach and a methodology for analyzing data from students interacting with and learning from hypermedia systems. Interactions are mutually influenced by individual students' goals and strategies and the actions supported by the interface of the learning environment. The approach is illustrated by modelling…

Compares humanlike versus machinelike interactional styles of computer interfaces, testing hypotheses that evaluative feedback conveyed through a humanlike interface will have greater impact on individuals' self-appraisals. Reflected appraisals were more influenced by computer feedback than were self-appraisals. Humanlike and machinelike interface…

Sixteen courses were taught over a 2-year period at eight universities using Perseus, a HyperCard-based hypermedia information system that contains multimedia information about the Greek world, in order to examine how type of assignment influenced student perceptions about the Perseus interface and learning performance. Data collection methods…