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This report includes a collection of reprints reporting natural language research. The problem of acquiring linguistic knowledge is the chief obstacle to widespread use of natural language technology. Chapter 1 and 4 report results of five to tenfold increase in our productivity in moving the Janus and Parlance natural language shells to new application domains. The ability of natural language systems to cooperatively handle novel, errorful, or incomplete forms is also critical; chapter 3 and 5 report new techniques for intelligently and graceful respond to such forms. Chapter 2 reports on an implementation of a discourse module for understanding definite reference.