A study conducted by Theodore Newcomb (1961) on college dorm roommates suggested that individuals with shared background, majors, attitudes, values, and political views became friends.The matching hypothesis proposed by Goffman (1952) suggests why people become attracted to their partner.
According to a personality psychologists' view, interpersonal attraction is a person's qualities that tend to attract by appealing to another person's desires.
When measuring interpersonal attraction, one must refer to the qualities of the attracted as well as the qualities of the attractor to achieve predictive accuracy.
The result showed that age and education level, are crucial in affecting the mate preference.
Because people with similar age study and interact more in the same form of the school, propinquity effect (i.e., the tendency of people to meet and spend time with those who share the common characteristics) plays a significant impact in spousal similarity.
The studies by Jamieson, Lydon and Zanna (1987, 1988) showed that attitude similarity could predict how people evaluate their respect for each other, and social and intellectual first impressions which in terms of activity preference similarity and value-based attitude similarity respectively.
In intergroup comparisons, high attitude similarity would lead to homogeneity among in-group members whereas low attitude similarity would lead to diversity among in-group members, promoting social attraction and achieving high group performance in different tasks (Hahn & Hwang, 1999).Many factors leading to interpersonal attraction have been studied.The most frequently studied are: The notion of "birds of a feather flock together" points out that similarity is a crucial determinant of interpersonal attraction.Additionally, perceived similarity was found to be greater than actual similarity in predicting interpersonal attraction.Findings suggest that interpersonal similarity and attraction are multidimensional constructs (Lydon, Jamieson & Zanna, 1988), in which people are attracted to others who are similar to them in demographics, physical appearance, attitudes, interpersonal style, social and cultural background, personality, interests and activities preferences, and communication and social skills.Researches showed that interpersonal attraction was positively correlated to personality similarity (Goldman, Rosenzweig & Lutter, 1980).