See discussions, stats, and author profiles for this publication at: https://www.researchgate.net/publication/234573070 Cognitive/Academic Language Proficiency, Linguistic Interdependence, the Optimum Age Question and Some Other Matters. Working Papers on Bilingualism, No. 19 Article · January 1979 CITATIONS READS 896 25,792 1 author: Jim Cummins University of Toronto 200 PUBLICATIONS 30,787 CITATIONS SEE PROFILE All content following this page was uploaded by Jim Cummins on 08 October 2014. The user has requested enhancement of the downloaded file. View publication stats