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Recent studies in both artificial intelligence and linguistics have demonstrated the need for a theory of the comprehension of anaphoric expressions, a theory that accounts for the role of syntactic and semantic effects, as well as inferential knowledge in explaining how anaphors are understood. In this paper a new approach, based on a theory of the process of focusing on parts of the discourse, is used to explain the interpretation of anaphors. The concept of a speaker's loci is defined, and their use is demonstrated in choosing the interpretations of personal pronouns. The rules for choosing interpretations are stated within a framework that shows: how to control search in inferring by a new method called constraint checking; how to take advantage of syntactic, semantic and discourse constraints on interpretation; and how to generalize the treatment of personal pronouns, to serve as a framework for the theory of interpretation for all anaphors.