M. A. K. Halliday is Emeritus Professor at the University of Gydney. As a self-styled 'generalist' he has published in many branches of linguistics, both theoretical and applied. The volumes in the present series encompass these aspects of Halliday's work. Jonathan J. Webster is Acting Head, Department of Chinese, Translation and Linguistics, and Associate Dean, Faculty of Humanities and Social Sciences at the City University of Hong Kong.