California state law A.B. 2666 establishes standards for provision of preschool special education programs and services for eligible children, aged 3-5, and their families. This handbook was developed as a resource in planning and implementing appropriate service models, and is organized into four major sections: "General Information,""Administration,""Assessment," and "Program Operations." The general information section contains the text of A.B. 2666 and supporting state and federal codes; an explanation of the key concepts of A.B. 2666; and a resource guide describing best practices in early childhood special education programs, including: program philosophy, community networking, developmental assessment, child development, educational planning and implementation, working with families, administrative concerns, staff development, environmental design, health concerns, and program evaluation. The administration section explains the funding model for A.B. 2666, the rationale for transdisciplinary early childhood assessment teams and integration of young children, and sample interagency agreements. The section on assessment contains information on conducting preschool assessments, the philosophy of team assessment, the importance of family involvement, and linking assessment to program planning. The final section on program operations covers family involvement, community networking, community resources, least restrictive environment, social integration, curriculum considerations, and needs assessment for staff development. (JDD)