The purpose of this research project was to determine if "Do We" Really Know Dewey?, a web-based tutorial, was effective for teaching students the Dewey decimal classification system. This qualitative study included observations, pre- and post-tests, interviews, and post-intervention surveys. Two classes of fifth-grade students used the tutorial in one forty-minute session. Immediately after using the tutorial, students completed worksheets which required them to match 14 book titles with the correct Dewey category. Two days later, students conducted two timed book searches in the media center. The research showed that most of the students liked using the tutorial and that most learned some basic facts about the Dewey classification system. However, the tutorial had little or no effect on most students' ability to conduct book searches. While a few students were able to locate their books in less than one minute, most could not. The results of this study were presented to the learning community and system media specialists through a PowerPoint presentation and a display in the media center.