SP500215 Knowledge-Based Searching with TOPIC chapter J. Lehman C. Reid National Institute of Standards and Technology D. K. Harman reasonable to examine, at least for selected topics, whether the first ten/best ten documents address the domain well from a domain "precision/recall" perspective. To the extent that the domain is well served in a few representative documents, the coverage in the representative documents may be a "better" answer for the user than the numerical count of the number relevant in the first 1000. We recommend adding a measurement of the coverage of the domain as the first ten/thirty/n results documents are examined. 220