This paper reports the results of the testing and use of a batch-mode program, QUERY, in three large computer runs performed by the ERIC (Educational Resources Information Center) Clearinghouse on Teacher Education from March through August 1970. Focus is on the behavior of QUERY as a search tool, not on cost-benefit analysis or comparison with alternative search tools. Section 1, "Findings," contains a description of how QUERY searches the descriptor field of ERIC resumes and the results of 39 different searches of the Research in Education (RIE) and Current Index to Journals in Education (CIJE) tapes. The analysis of output for each search--25 of them substantive (related to information analysis activities of the CLEARINGHOUSE) and 14 serving both substantive and experimental purposes--includes the number of documents retrieved, percentage of relevance, notes on significant characteristics of relevant and irrelevant documents, etc. Section 2, "Outcomes," presents practical implications and general impressions of the findings. Included are examples of improvements in question translation as a result of the study, a nine-step guide to the use of QUERY in searching the ERIC files, and recommendations for further testing of the program. (JS)