1. Patricia J. Agnew, M.B.A.O.T., Dip.O.T. (Wits), is a Lecturer in the Department of Occupational Therapy, University of Queensland, St. Lucia, Brisbane 4067, Australia
2. Gerald F. Shannon, Ph.D., is a Reader in the Department of Electrical Engineering, University of Queensland, St. Lucia, Brisbane 4067, Australia