Forty years ago a group of students hoping to make a bit of holiday money turned up at a basement in Stanford University, California, for what was to become one of the most notorious experiments in the study of human psychology.

The Stanford prison experiment was supposed to last two weeks but was ended abruptly just six days later

Despite their uniforms and mirrored sunglasses, the guards struggled to get into character and at first Prof Zimbardo's team thought they might have to abandon the project.

Our study was terminated on August 20, 1971

rebellion which broke out on the morning of the second day. The prisoners removed their stocking caps, ripped off their numbers, and barricaded themselves inside the cells by putting their beds against the door.

At 2:30 A.M. the prisoners were rudely awakened from sleep by blasting whistles for the first of many "counts." The counts served the purpose of familiarizing the prisoners with their numbers (counts took place several times each shift and often at night). But more importantly, these events provided a regular occasion for the guards to exercise control over the prisoners

The guards were given no specific training on how to be guards. Instead they were free, within limits, to do whatever they thought was necessary to maintain law and order in the prison and to command the respect of the prisoners.

The use of ID numbers was a way to make prisoners feel anonymous. Each prisoner had to be called only by his ID number and could only refer to himself and the other prisoners by number.

The prisoner was then issued a uniform. The main part of this uniform was a dress, or smock, which each prisoner wore at all times with no underclothes. On the smock, in front and in back, was his prison ID number. On each prisoner's right ankle was a heavy chain, bolted on and worn at all times. Rubber sandals were the footwear, and each prisoner covered his hair with a stocking cap made from a woman's nylon stocking.

functional simulation

A degradation procedure was designed in part to humiliate prisoners and in part to be sure they weren't bringing in any germs to contaminate our jail.

24 college students from the U.S. and Canada who happened to be in the Stanford area and wanted to earn $15/day by participating in a study. On all dimensions that we were able to test or observe, the

Sunday morning in Augus

police car swept through the town picking up college students as part of a mass arrest for violation of Penal Codes 211, Armed Robbery, and Burglary, a 459 PC.