Shared methods, procedures, documentation, and data are essential features of science. This observation is illustrated by autobiographical examples and, far more important, by the history of astronomy, geography, meteorology, and the social sciences. Unfortunately, though sometimes for understandable reasons, data sharing has been less common in psychological and medical research. The China Family Panel Study is an exemplar of contemporary research that has been designed from the outset to create a well-documented body of shared social-scientific data.