This report, representing the first half of a comprehensive study, describes the personnel of the Social Services Component in Title IV-A Day Care in Philadelphia and discusses some of the functions and services provided by these personnel. Data were based on responses from 129 service workers in 38 agencies. Respondents reported information on 21 variables concerning their background and training conditions, and identified what they perceived to be the primary services of their agencies. Responses on all variables are reported and data on four major questions are presented in some detail; these four involve the types of direct services provided and the educational background, caseload and percentage of time spent in direct services by assistants/aides, social workers and supervisors. The most important services identified were information and referral, counseling, and participation in parent activities in day care. Educational backgrounds of assistants/aides and social workers were found to be different but their jobs were found to be similar, except that social workers provided more of the direct services to families while assistants/aides spent more time on eligibility and parent participation activities. More than half of all social service workers were supervised by an agency director rather than a social service supervisor. Tables are included. (Author/JMB)