The study attempts to test hypotheses derived from the model of interpersonal attraction suggested by Kerckhoff and Davis, who investigated the issue of need complementarity versus similarity in their longitudinal research upon couples who were engaged or otherwise seriously attached and who proposed that homogamy in social attributes is instrumental in the early stages of the relationship, then value-consensus, and finally, need complementarity. The current study introduces a personality variable, Machiavellianism, which can differentiate between the proposals of Kerckhoff and Davis and those made in other research and which is also essential to evaluation of the former's model. The subjects sampled were well established female college roommate pairs. Age, year in college, and major field of study were used to determine similarity in social attributes. The Allport-Vernon-Lindzey Scale of Values and the College Student Questionnaire were selected in order to ascertain degree of value-consensus and also to assess accuracy of perception and assumed similarity. The Mach Scales were employed to indicate complementarity and to relate personality to perception data. Results are discussed in relation to the Kerckhoff and Davis formulation and to Machiavellianism. (Author/SES)