Norman Fenton is Professor of Computing Science at the Centre for Software Reliability, City University, London and also Managing Director of Agena Ltd, a company specializing in risk management for critical computer systems. He is a Chartered Engineer who previously held academic posts at University College Dublin, Oxford University and South Bank University where he was Director of the Centre for Systems and Software Engineering. He has been project manager and principal researcher in many major collaborative projects. His recent and current projects cover the areas of: software metrics; safety critical systems assessment; Bayesian nets for systems' assessment; software reliability tools. Professor Fenton has written several books on software metrics and related subjects.