Research findings on bilingual preschool children (2-1/2 to 6 years of age) and programs are presented. Working definitions are given for some of the terms used in the report. Research findings are divided into four categories: (1) "The Community" focuses on the findings from the fields of social psychology and sociolinguistics; (2) "The Bilingual Child" considers those findings from linguistics and psycholinguistics; (3) "Of Special Interest to Educators" answers some specific questions; and (4) "Testing the Bilingual Preschooler" summarizes several issues associated with assessing to what extent a child is bilingual, and draws attention to possible approaches that may be used to assess the intelligence of a bilingual child. Practical Guidelines for the Teacher and Administrator are given, followed by specific guidelines that relate to the community, the parents, the children, the teacher and her aide, and goals. Examples of existing bilingual preschool programs that fit into one of the four following categories are given: (1) one way: dominant language; (2) one way: bilingual; (3) mixed: dominant language; and (4) mixed: bilingual. Additional sources of information on bilingual programs and teaching aids are presented in two categories: Handbooks and Teaching Aids, which are for use in Spanish-speaking or Indian-speaking classes. A bibliography concludes the report. (DB)