The Harley, Brigit editor Allen, Patrick editor Cummins, Jim editor Swain, Merrill editor text xx Estados Unidos Cambridge University Press 1990 9999 1a monographic und eng 248 p. : 15 x 23 cm This volume presents the results of a major investigation of second language proficiency in various groups of school age learners. The contributors, who are experts in the field of bilingual education and second language acquisition, address such issues as the nature of language proficiency, the impact of classroom practices on second language learning, the relationship between social-environmental factors and bilingual proficiency. This original collection of articles will be of interest to all those concerned with policy and practice in second language education. Editado por Brigit Harley, Patrick Allen, Jim Cummins y Merrill Swain Lenguaje y lenguas Estudio y enseñanza Congresos Adquisición de segundo lenguaje Congresos P51 D48 0-521-38795-7 200729 20250116163850.0 spa