BRIAN WILSON has a background in nuclear power engineering and control system design. In 1966 he became a founding member of the Department of Systems Engineering at the University of Lancaster, where he pursued the application of control principles to management problem solving. There he was involved in the development and use of Human Activity Systems and 'verbs in the imperative' in place of mathematics as the modelling language for the intellectual processes involved and maintained particular interest in the application of SSM to information and organisation-based analysis. This research was published in Systems: Concepts, methodologies and Applications by John Wiley Sons.