1. In a computer system, a method for providing a user with newly-received documents having a selected range of relevance, said method comprising the computer-implemented steps of: providing a first set of training data having plurality of training documents, said first set of training data having a first collective absolute relevance indicative of an extent to which said plurality of training documents includes preferred content; specifying a relative relevance threshold indicative of a relevance of desired newly-received documents relative to said first collective absolute relevance; selecting, for said first set of training data, a selected range bounded by an absolute-relevance threshold corresponding to said relative relevance threshold; determining whether a newly-received document has an absolute-relevance score within said range, said absolute relevance score being indicative of an extent to which said newly-received document includes preferred content.