DLI Research

Dual Language/Immersion Research, Reports and Articles


There is a considerable body of research that outlines the benefits of dual language/immersion programs for students, including:

  • higher academic performance,

  • greater cognitive development in mental flexibility, creativity, and divergent thinking,

  • high levels of proficiency in the target language and in English,

  • positive cross-cultural attitudes and behaviors, and

  • enhanced career opportunities.


Here are some recent publications that describe these benefits.

Note: All documents are hyperlinked from a Google drive. Please click on the item you would like and download a copy using the download arrow in the center.


Thomas & Collier Studies in North Carolina

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Dr. Virginia Collier and Dr. Wayne Thomas,
Professors Emeritus at George Mason University,
have conducted a longitudinal study of
North Carolina's dual language/immersion programs.
Here are the results of that work in report form:


Year 1 (2007-2008)


Executive Summary (3 pages)


Full Report (46 pages)

Year 2 (2008-2009)


Executive Summary (3 pages)


Full Report (45 pages)

Year 3 (2009-2010)


Executive Summary (3 pages)


Full Report (65 pages)






In addition, "Astounding Effectiveness - The North Carolina Story" was included as Chapter 5 in Thomas & Collier's book,
Dual Language Education for a Transformed World (ISBN: 978-0-9843169-1-5).
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University of North Carolina (UNC) - Charlotte Research on Dual Language/Immersion


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Dr. Joan Lachance,
Assistant Professor of TESL at UNC-Charlotte,
is conducting a number of studies with educators
in dual language/immersion programs.


Below is her most recent publication, and
more will be posted when they are available.
A Case Study of Dual Language Program Administrators: The Teachers We Need
International Journal of Educational Leadership Preparation
Spring 2017, Volume 12, Number 1
pages 1 - 18






U.S. Department of Education: Office of English Language Acquisition

Dual Language Education Programs: Current State Policies and Practices (December 2015)
Full Report



Recommended Books & Other Research Materials


The Psycholinguistics of Bilingualism by Francois Grosjean and Ping Li

ISBN-13: 978-1444332797 (Paperback version; also available in Hardcover and Kindle)