Users seemed to have a reasonable idea of why they needed to make relevance judgements. Ideas included:
``It was making logical leaps for me.'';
``The information goes into a log to keep track of what I'm doing.'';
``Maybe there's an expert system working underneath.'';
``So the library can keep track of what's been used.'';
``So that the people running the system can see if the search provided relevant sources.'';
``It can help the machine to find more books like the one I'm looking for.''
Two users said that they did not know why they had been asked to make relevance judgements, with one saying that he did not think it was of practical significance. One user thought that their purpose was to narrow down the search in some way, which indicates that they may have thought of Enquire as a boolean system, perhaps removing query terms on the basis of ``No'' judgements.