probability of a student cheating if they have seen someone else cheat. However, even if most students strongly disapprove of cheating, there has to be a community in order for those norms to be enforced via peer pressure. For instance, larger schools, which usually have much higher cheating rates than small schools, tend to have a weaker community, being more split up into different peer groups that exert little social pressure on each other. Another measure of a college community, how many students live on campus, further shows a significant relation with a school's cheating rate. Relatedly, many professors argue that smaller classes reduce cheating behavior. Ethical causes No matter what the demographic or contextual influences are on a student who decides to engage in cheating behavior, before they can cheat they must overcome their own conscience. This depends both on how strongly someone disapproves of academic dishonesty and what types of justifications the student uses to escape a sense of guilt. For instance, students who personally do not have a moral problem with academic misconduct can cheat guilt-free. However, while many students have been taught and have internalized that academic dishonesty is wrong, it has been shown that on average a third of students who strongly disapprove of cheating have in fact cheated. People who cheat despite personal disapproval of cheating engage in something called "neutralization", in which a student rationalizes the cheating as being acceptable due to certain mitigating circumstances. According to psychologists of deviant behavior, people who engage in neutralization support the societal norm in question, but "conjure up" reasons why they are allowed to violate that norm in a particular case. Neutralization is not a simple case of ex post facto rationalization, but is rather a more comprehensive affair, occurring before, during, and after the act of cheating. Researchers have found four major types of neutralization of academic dishonesty, which they categorize by type of justification. Denial of responsibility – that is, the accusation that others are to blame or that something forced the student to cheat – is the most common form of neutralization among college students who cheated, with 61% of cheaters using this form of justification. Condemnation of condemner – that is, that the professors are hypocrites or brought it on themselves – is the second most common form of college student neutralization at 28%. The third most popular form of neutralization among