This interim evaluation report focuses on process (formative) and outcome (summative) data collected in spring 1975 on the National Home Start Program. Home Start, a federally-funded 3-year (1972-1975) home-based demonstration program for low-income families with 3- to 5-year-old children was designed to enhance a mother's skills in dealing with her own children and to provide comprehensive social-emotional, health and nutritional services. Chapter II presents information on the characteristics of the national program and the individual Home Start projects and describes program costs and services delivered. Chapter III analyzes several issues related to program operations--program duration, support extended after family graduation, national office support, home visitor supervision, nutrition services and projects' future plans. Chapter IV presents data bearing on several questions relating to the home visit process, program costs and program effects. (Author/MS)