Digital libraries: introduction

In 1980 1 decided to try to empirically prove two ideas about information retrieval systems. First, I wanted to show that more effective retrieval would result from "soft" or "extended" Boolean methods [SALT83]. Second, I wanted to show that good techniques for combining information from various sources (e.g., keyword data and citation-based data) would allow the richer base of information to help ensure more effective retrieval.