Dr. K. McGuffie is a Reader in the Department of Applied Physics at the University of Technology, Sydney. His research interests are in the development of one and three-dimensional climate models, and he continues to work with real observations of the climate system. He has published over 40 papers and articles dealing with climate and climate modelling.Professor A. Henderson-Sellers is the Deputy Vice Chancellor (Research and Development) at the Royal Melbourne Institute of Technology. She maintains an active interest in climate modelling and climate impacts and has been a prominent participant in the Intergovernmental Panel on Climate Change process. She has published over 300 papers and books dealing with climate modelling and related issues.