This study looks at the relationship between the size of the small interacting group (in numbers of persons) and its environment in this case, the density of its immediate population. We hypothesized that persons in more densely populated areas will gather for social interaction in smaller groups, in fewer bisexual groups. As density increases, males will tend to gathes in smaller groups than females. The sample for this study was drawn from three university campuses with varying population density (University of Texas at Austin, Southwest Texas State University, San Marcos, Texas, and Saint Edward's University, Austin, Texas-in order of decreasing density). The number and sex of persons making up interacting groups during the lunch break in the respective cafeterias of these universities was tallied and a typical (average) size group was computed for each university. All hypotheses were supported, indicating a significant inverse relationship between population density and the size of small interacting g...