My hypothesis about conduct disorder in children can lead to criminal activity in adulthood. The research conducted starting from this question was that of the Memorial University of Newfoundland, Department of Psychology. Sampson and Laub (1997) viewed conduct disorder not as a single cause of adult criminal behavior, but rather as the beginning of what they called a lifetime of “cumulative disadvantage.” The conduct disorder may indeed be the initial cause of the problems, but it may be replaced by the effects of disapproval and negative reactions from others. Based on previous research, Kratzer and Hodgins (1997) were aware of the association between childhood and adult conduct problems. criminal behavior. The children were divided into four groups. The first three groups were based on where the conduct problems appeared. The first group was made up of children who showed conduct problems at school. The children's behavior was rated by their teachers in sixth and seventh grade on a three-point scale. For the second group a child was considered to have a conduct problem in the community if he or she had been reported to the Child Welfare Committee as having conduct problems (such as theft, stealing, vandalism, and substance abuse) before the age of 15 years old. The third group consisted of children who exhibited conduct problems both in the community and at school. Finally, the fourth group consisted of children who did not show any cheating...