A revised Spanish/English oral-proficiency test battery was administered to 40 Spanish-surnamed pupils equally divided by sex at grade levels 1, 3, 5, and 7. The test battery included parallel Spanish and English versions of: (1) a 12-item vocabulary pretest, (2) a 32-item vocabulary-by-domain test consisting of four sections--home, neighborhood, church, and school--of eight items each, and (3) a 32-item grammar production test requiring 10 different grammatical operations. The pupils' performance was similar (balanced) in both languages on the home and neighborhood domains in all grades; Spanish was dominant on the church domain in grades 1 and 3, balance not being achieved until grade 7. English was dominant only on the school domain in grade 5. Spanish was dominant on the grammar test through grade 5, with balance achieved in grade 7. The general tendency was for test scores to improve with grade level or years in school. The amount of variance in the test scores that could be reliably attributed to language use (i.e., language spoken with father, mother, friends, etc.) or demographic variables appeared small. Information about the reliability of test items and about correlations between the Spanish and English versions is given here, and the complete vocabulary and grammar tests are provided in appendixes. (Author/PMP)