Potowski (Spanish, U. of Illinois, Chicago) presents findings from a multiyear case study of four students attending one of the oldest Spanish-English dual immersion schools in the U.S. The text describes and explains the patterns of Spanish and English use by the four students--two first-language (L1) Spanish, two second- language (L2) Spanish--in fifth grade and again in eighth grade, and describes their Spanish proficiency in eighth grade. The findings suggest that although dual immersion can be a successful model for linguistic and cultural education, both L1 and L2 students may not be using as much Spanish as educators believe. Students did not use Spanish for a wide variety of communicative purposes, and the findings suggest the prevalence of English in the wider society affects students' language use in the classroom. No subject index. Distributed in the U.S. by UTP Distribution. Annotation ©2007 Book News, Inc., Portland, OR (booknews.com)