Experiments involving large social units, such as schools, work sites, or whole cities, are commonly limited in statistical power because the number of randomized units is small, leaving few degrees of freedom for residual (between-unit) error. The authors describe a method for increasing...

The National Institutes of Health sponsored a conference on the Design and Analysis Issues in Community Trials on March 23,1992, in Bethesda, MD. This article presents a synopsis of each of the seven presentations given at that conference and summarizes the discussion that followed.

A methodology for a process evaluation system as applied to the Pawtucket Heart Health Program is described. The rationale, goals, and design of this system, which are suited to the documentation of community demonstration programs or other interventions, are discussed. Examples of data from the...

A five-year project, building on an ongoing epidemiological study of menopause in 2500 women, will examine the aging process in middle-aged and older men, women, and couples in Massachusetts. While past research on aging has usually focused on disease and has drawn on a self-selecting, usually...