This document describes and analyzes the 1976-1977 Head Start Program Information Report (PIR) data. PIR is a comprehensive data collection effort directed at the programs of all Head Start grantees of which there were approximately 1,100 in 1976-1977. The unit of analysis in this study is the grantee rather than the agencies delegated by grantees to implement Head Start programs. The Head Start program descriptions are analyzed by PIR according to enrollment sizes, ethnic composition of staff and children, children's ages, average classroom sizes, staff/child ratio, and program costs. The resulting data are used to determine which program characteristics relate to program costs per child, what meaningful comparisons and contrasts among types or clusters of programs can be made, and what the statistical ranges in cost variations are. Also included in this document are the following areas of PIR information: organizational and geographic characteristics of grantees; health services information regarding Head Start children; food services, social services, and parent involvement information; funding received by grantees from different revenue sources and the costs incurred against such revenues. (Author/DB)