McField,
G. and McField, D. 2014. "The consistent outcome of bilingual education
programs: A meta-analysis of meta-analyses." In Grace McField (Ed.) 2014. The
Miseducation of English Learners. Charlotte: Information Age Publishing. pp.
267-299.
McField
and McField analyzed all comparisons done in all meta-analyses of bilingual
education vs. comparison programs (students with similar background in
all-English programs) for tests of English proficiency. Previous meta-analyses
found positive effect sizes for bilingual education, ranging from .18 to .33.
McField and McField reported that when both program quality and research
quality are considered, the effect size in favor of children in bilingual
education programs is larger, d= .41.
This
should settle the argument: bilingual programs, when set up correctly and
evaluated correctly, do not prevent the acquisition of English – they
facilitate it.
(Note:
An effect size of .2 is considered "small," .5 "moderate"
and .8 "large.")
Thanks, sounds a very important piece of analysis. I'd like very much to get a copy of that article, but looking at the contents here (http://www.infoagepub.com/products/The-Miseducation-of-English-Learners) I can't see it listed.
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