People will, moreover, take action to reduce discrepancies in attitudes, whether by changing others to bring them closer to oneself or by changing one's own attitudes to bring them closer to others. They will likewise take action to reduce discrepancies in abilities, for which there is an upward drive to improve one's abilities. Thus Festinger suggested that the "social influence processes and some kinds of competitive behavior are both manifestations of the same socio-psychological process...[namely,] the drive for self evaluation and the necessity for such evaluation being based on comparison with other persons." Festinger also discussed implications of social comparison theory for society, hypothesizing that the tendency for people to move into groups that hold opinions which agree with their own and abilities that are near their own results in the segmentation of society into groups which are relatively alike.