To ensure optimal care, preventive and developmental health care services should be tailored to the specific needs of a child and his or her family. In order to do so, health care providers must have information about the particular risks to health and development that the child faces, as well as the ability of the family to adequately address those risks. An earlier Fund project developed a brief, research-based questionnaire that would allow the physician to obtain this information and prescribe targeted preventive services. The proposed project will test the validity of that instrument, its effectiveness in identifying children at varying levels of risk, and the feasibility of using it in the practice setting. In addition, the research team will develop clinician guidance on the core preventive care services that ought to be provided to children at each age and risk level.