Compared 3 alternative structural models of the nature of love, assessed the validity of each of these models for a variety of close relationships, and predicted success of close relationships on the basis of instruments used to assess love and other personal characteristics. The present study investigated whether love is better characterized as C. Spearman's (1927) unifactorial entity that is unitary and nondecomposable into underlying constituents; (2) G. H. Thomson's (1939) entity comprising a large number of affective, cognitive, and motivational bonds that, in the experience of love, are jointly sampled; or (3) L. L. Thurstone's (1938) entity comprising a small number of correlated primary factors of roughly equal importance and salience in the experience of love. 35 male and 50 female 18–70 yr olds completed psychometric instruments measuring their demographic backgrounds, personality characteristics, love history, and feelings of love in close relationships with mothers, fathers, siblings, same-sex best friends, and spouses or lovers. Factor analysis of the love scales suggested that love is best characterized in terms of the Thomsonian "bonds" model and that the structure of love is quite similar across the various close relationships in which one engages. It is concluded that success of close relationships can be predicted from a set of measures that includes a love scale and measures of personal attributes. (52 ref) (PsycINFO Database Record (c) 2016 APA, all rights reserved)