This subseries consists of documents relating to a 1978 study on coupled relationships conducted by Latham, John Ramsey, Jr., and Carol U. Lindquist. The subjects included gay, lesbian, and heterosexual couples, and both partners filled out surveys about their relationships at the same time. The surveys included an 11-page structured interview, a Marital Adjustment Test (MAT), a Goals Questionnaire (GQ), and an abridgement of the Stuart Marital Pre-Counseling Inventory. The study found that the type of relationship (gay couple, lesbian couple, or heterosexual couple) did not, in itself, determine a couple's adjustment in a relationship. The paper that was written on the study was presented at the American Psychological Association Convention on August 29, 1978. The series includes the surveys, the paper written about the study, and presentation notes from the convention. The series also includes survey administration and data analysis information, scoring templates, and correspondence related to the study.