Estimates of frequency of spelling errors are made based on a sample of 3,600 index terms drawn from 11 bibliographic data bases. The impact of these errors is discussed by tape supplier, tape user, and end user; with some suggestions for search strategies.

This collection of search formulations was assembled to assist in Dialog Searching of the ERIC data base. The formulations represent modular building blocks or concepts that occur frequently when searching this file. They have been formulated and described in such a way that they can be used as given, or they can be modified to suit specific…

This workbook is designed primarily for graduate library school students in a supervised laboratory setting as an adjunct to a formal course on computer based reference services. The DIALOG system has the capability to search several large on line files, and the workbook is designed to be used in conjunction with the Lockheed DIALOG Manual. Eight…

In order to identify and explain the reasons for differences in average on-line search rates among terminal installations, the operations and performance of several facilities using the Lockheed DIALOG system for on-line searching of the ERIC data base were studied. Detailed examinations were made of such aspects as the DIALOG system response time…