First published in 2004 by the
Centre for Longitudinal Studies
Bedford Group for Lifecourse and Statistical Studies
Institute of Education, University of London
20 Bedford Way
London WC1H 0AL
website: www.cls.ioe.ac.uk
© Centre for Longitudinal Studies
ISBN 1 898453 51 9
The Centre for Longitudinal Studies (CLS) is one of five centres that comprise
the Bedford Group for Lifecourse and Statistical Studies
(www.ioe.ac.uk/bedfordgroup).
CLS is devoted to the collection, management and analysis of large-scale
longitudinal data. It has responsibility for Britain's internationally renowned birth
cohort studies, the National Child Development Study (1958 cohort) and the
1970 British Cohort Study, and leads the consortium conducting the ESRC's
Millennium Cohort Study.
The views expressed in this work are those of the authors and do not necessarily
reflect the views of CLS or the Economic and Social Research Council. All errors
and omissions remain those of the authors.