David Wright obtained a BSc degree in Mathematics from the University of London. He has worked as a Scientific Officer at the Defence Operational Analysis Establishment (MoD) and later as a Research Assistant in non-linear filterin g theory during a three year collaborative research project between Royal Holloway College Department of Statistics and Computer Science, and Ferranti Computer Systems Ltd. He is currently employed as a Research Fellow at CSR and is completing a PhDthesis on software reliability prediction. During his current and previous employments he has taught at undergraduate level both Statistics and Software Engineering. His research interests include prediction based on failure-count data, the incorporation of 'ex planatory variables' in reliability predictions, the elicitation and combination of experts' systems-dependability judgements, the application of Bayesian nets to systems dependability assessment, and the question of the extent to which empirical informat ion about achieved reliability levels can legitimately be used as the basis of prediction, either from one system to another, or from one execution environment to another.