This document describes Denmark's 10-year (1965-75) program of cost-effective provision of social services to crisis families with children under the Danish 1964 Child and Youth Welfare Act. The program, voluntary and open to all families, provided preventive psychosocial services for children based on a family support system. The background to the Family Guidance Program, including the social experimentation which led to the drafting of the 1964 Act, is sketched. The program is described in terms of administrative structure, provision of services, program evaluation and results. Special training for family advisors who were not qualified social workers is described, a cost analysis is made, and the program impact on the overall system of human services is indicated. The enthusiasm with which this family-centered, neighborhood-located, and caseworker-coordinated program of services was received by the general public was one of the important factors precipitating the decision in Denmark to reform the entire welfare system. Effects of the program on service providers are traced, and problems, including questions of central vs. local control, program scale, stigmatic aspects of receiving aid, rehabilitation of hardcore families, and client dependency, are explored. Lessons from the Danish experience are identified. The summary and conclusions of the social research which led to the 1964 Act, the text of the Act, and a survey of 80 participating families are appended. (Author/RH)