Context: Policy discussions about improving the U.S. health care system increasingly recognize the need to strengthen its capacities for delivering public health services. A better understanding of how public health delivery systems are organized across the United States is critical to improvement. To facilitate the development of such evidence, this article presents an empirical method of classifying and comparing public health delivery systems based on key elements of their organizational structure.Methods: This analysis uses data collected through a national longitudinal survey of local public health agencies serving communities with at least 100,000 residents. The survey measured the availability of twenty core public health activities in local communities and the types of organizations contributing to each activity. Cluster analysis differentiated local delivery systems based on the scope of activities delivered, the range of organizations contributing, and the distribution of effort within the system. Findings: Public health delivery systems varied widely in organizational structure, but the observed patterns of variation suggested that systems adhere to one of seven distinct configurations. Systems frequently migrated from one configuration to another over time, with an overall trend toward offering a broader scope of services and engaging a wider range of organizations. Conclusions:Public health delivery systems exhibit important structural differences that may influence their operations and outcomes. The typology developed through this analysis can facilitate comparative studies to identify which delivery system configurations perform best in which contexts.

he study described in this article identifies local public health agency capacity characteristics that are related to their local public health systems' performance scores on the CDC's National Public Health Performance Standards Program assessment instrument. Public health system performance scores from a test version of the National Public Health Performance Standards instrument (5b) from county and city/county jurisdictions in three states were matched to organizational capacity data from the 1997 National Association of County and City Health Officials profile of health departments, resulting in a sample of 152 jurisdictions. Twenty-eight capacity variables from the profile and all 10 scores on the Essential Public Health Services plus the total performance score were analyzed in 11 separate multivariate regression models. Public health agency capacities in the areas of funding, organizational leadership, and certain nonprovider partnerships were found to be significantly related to public health system performance. Further study is needed to determine if these relationships between agency capacities and system performance are found, with data from other states now using the nationally released performance assessment instruments and with capacity measures that are more specific for evaluating public health system performance.