Expansion of registry and tracking systems. States can promote the coordination and expansion of registry and tracking projects with the aim of developing a statewide system. Federal leadership in Congress and the Public Health Service can encourage the further development of a national system of state-based registries.

Population-based data after health care reform. Parties concerned about immunization (e.g., federal agencies, state and local health departments, providers, and community organizations) can monitor the effects that health care reform measures have on the organization of health services and information systems to ensure that the population-based data necessary to assess the immunization status of preschool children are available.