Mick Silver is Professor of Business Statistics and Head of the Quantitative Methods Group at Cardiff University. He has recently returned from a sabbatical as a Senior Research Fellow at the US Bureau of Labor Statistics and consultant at the International Monetary Fund, Washington DC. He has published extensively in the academic literature on issues relating to price level measurement, including recent papers in the Economic Journal and the Journal of Political Economy. He is also responsible for a text on Business Statistics (McGraw-Hill, 1999). He works closely with governmental statistical agencies including the UK Office for National Statistics and intergovernmental agencies such as the IMF, UN, ILO and World Bank in developing methodologies for better price statistics.