Explored how four teachers' theories might be complemented or contrasted by the underlying theoretical position of California's Proposition 227 and how their theories mediated teaching of language minority students. Discusses the implications of additive and subtractive competitive structures for policy and practice related to language minority…

Describes dual language instruction models, and presents a paradigm for examining congruence among theoretical models, teacher beliefs, and actual classroom practices to determine program effectiveness. Examples illustrate implementation pitfalls. Analysis of Proposition 227 finds it to be a decontextualized procedural model; it has an incoherent…