completing a psychological test, researchers whittled down the numbers to 15 who were judged to be well-rounded and from a cross-section of society. They included a former drug addict, a multi-millionaire businessman and a fireman. Dr Reicher was anxious to ensure none of the participants were obviously racist, aggressive or authoritarian, to eradicate any bias from the start. The volunteers were warned they might face exercise, tasks, hardship, hunger, solitude and anger. Only men were asked to apply because of the 24-hour surveillance by male scientists. Ian Burnett, 22, admits he was terrified as he walked through the double doors leading to the specially constructed jail.