An attempt is made to sketch the structure of a science, in the sense
of an ordered body of knowledge, of interpersonal relationships. The s
pecial properties of relationships are discussed. Relationships exist
over time, involve properties beyond those of the constituent interact
ions, include both behavior and subjective experience, and exist in a
social context. It is suggested that a science of human relationships
will require three overlapping phases: (1) Description, listing 10 cat
egories of dimensions potentially useful for ordering the data; (2) Pr
inciples of dynamics, which may concern external influences on the dya
d, interchanges between een the participants, or intrapsychic processe
s; and (3) The specification of the limits of applicability of those p
rinciples. In general, a balance must be found between the search for
generalisations and recognition df the complexity of human relationshi
ps.