use a language other than English to teach subject matter content;
integrate language teaching with content teaching;
offer instruction through the immersion language for at least 50 percent of the school day during the pre-school and elementary years; offer a minimum of two content areas taught through the immersion language in middle and secondary continuation programs;
promote additive bi- or multilingualism, (i.e., enriched instruction in the immersion language sustained through the elementary years, including maintenance and development of the English language both in and out of school);
are school-based programs that are held accountable for evaluating academic achievement in the content areas;
employ teachers who are highly proficient in the language(s) they use for instruction; and,
clearly separate teacher use of one language versus another for sustained periods of time.