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Large-Scale Social Experimentation in Britain

What Can and Cannot be Learnt from the Employment Retention and Advancement Demonstration?

University of Maryland, Baltimore County, USA, dhgreenb{at}umbc.edu

Stephen Morris

Department for Work and Pensions, UK, stephen.morris4{at}dwp.gsi.gov.uk

The Employment Retention and Advancement (ERA) Demonstration programme is a major current welfare-to-work social experiment, the largest random allocation evaluation ever mounted in Great Britain. This article draws on experience gained in designing the ERA Demonstration to explore the strengths and limitations of social experimentation for policy evaluation and analysis. The focus of the discussion is on the reasons for the choice of random allocation as a mean of estimating programme impacts, contrasting this approach with the alternatives. The weaknesses of random allocation designs are also examined in the light of the types of information policy-makers require from evaluations of labour market programmes and social policy demonstrations. The perennial ‘black box’ problem and the difficulties in generalizing from social experiments are given particular prominence.

Key Words: impact analysis • labour market programmes • policy demonstrations • random allocation • social experiments

Evaluation, Vol. 11, No. 2, 223-242 (2005)
DOI: 10.1177/1356389005055529


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