Gilligan supports her theory with research of children at play conducted by Northwestern University sociologist Janet Lever.’ Lever found that boys like games with lots of intricate rules. Disputes often arise over interpretations of the rules, but the argument doesn’t break up the game. In fact, Lever notes that some boys seem to enjoy wrangling over the rules even more than the game itself. Since rules are sacred, a cry of "That’s not fair!" is an accusation with moral force. Girls, on the other hand, play shorter and less complex games. When arguments arise, girls will usually bend the rules so no one will feel hurt. Gilligan believes that this difference carries over into adult life. Women change the rules in order to preserve relationships; men abide by the rules and see relationships as replaceable.