The Network of Relationships Inventory (NRI) examines a broad array of relationship characteristics across a number of different types of personal relationships (Furman & Buhrmester, 1985). The most important feature of the NRI is that participants use the same set of items to describe their relationship with each of several members of their social network (e.g., mother, father, sibling, friend, romantic partner, and teacher.). This feature results in a matrix of “relationships by qualities” scores that is useful both for describing average (mean-level) differences among different types of relationships and for describing each type of relationship in terms of a profile of qualities. The matrix of scores has also proven useful in measuring of individual differences in relationship qualities, allowing researchers to examine the similarities and differences among various relationships and to evaluate how individual differences in relationships qualities are associated with other individual outcomes (e.g., loneliness, depression) and relationship outcomes (e.g., stability of relationships).