In the course of his career, Professor Halliday has continued to address the issue of the application of linguistic scholarship for computational and quantitative studies. The sixth volume in the collected works of Professor M. A. K. Halliday includes works that span the last five decades, covering such topics as machine translation: the early years; and probabilistic grammar. The last section of this volume includes discussion of recent collaborative efforts bringing together those working in systemic functional grammar, fuzzy logic, and "intelligent computing," engaging in what Halliday refe