The test manual for the Secondary Level English Proficiency (SLEP) test has been prepared for teachers, counselors, and others responsible for interpreting SLEP test scores. The SLEP is designed to assess the proficiency in English of students entering grades 7 through 12 whose native language is not English. As a test of understanding written and spoken English, the SLEP is available to secondary schools in the United States and overseas. This manual contains the following: (1) an overview of the SLEP program; (2) general instructions for the test; (3) general information about and specific instructions for administering the test; (4) scoring the answer sheets; (5) interpreting the SLEP scores; (6) statistical information; (7) language proficiency levels; (8) the relationship between the SLEP and the Test of English as a Foreign Language; (9) additional factors to consider in using SLEP scores; and (10) an annotated list of nine references. Sixteen data tables are included. (SLD)