4. We developed a Prison Officer questionnaire that sought to obtain views on key issues such as safety, security and decency. These questionnaires were distributed to randomly sampled Prison Officers during our prison visits. The survey return was 90 per cent.
5. The prisoner survey was undertaken by MORI. They randomly sampled 2,000 prisoners from PFI, privately-managed and public prisons. The survey population differed in comparison with the prison officer survey by the inclusion of Feltham and Reading and the exclusion of Lancaster Farms and Bullingdon. We discussed the methodology and results of our surveys with Dr Alison Liebling and Mrs Linda Durie of the Institute of Criminology, University of Cambridge.