Project Effective Transition of the Bilingual and Bicultural Student to Senior High School (ETBBS) at Thomas Jefferson High School in Brooklyn, New York, provided additional administrative and instructional staff in order to offer instructional services to 165 foreign born students, mostly from Puerto Rico and Haiti. The program was designed to develop English proficiency, and offered instruction in native language arts, social studies, mathematics, and science. This report describes the 1981-82 implementation of the program and discusses the sources of funding, participants, program content, instructional and noninstructional components, parent involvement, and staff development. Analysis of student achievement indicates that: (1) students gained on reading ability of Spanish but failed to achieve the program objective in this area; (2) the program objective for science was met but performance for mathematics and social studies fell short of the goal; and (3) attendance rates of the participants were better than those of nonparticipants. Recommendations include more encouragement for teachers to serve as linguistic models and more confidential counseling and guidance services for students.(AOS)