The document discusses several key concepts related to teaching English Language Learners:
1) Dual language programs teach literacy and content in two languages, with both native English speakers and language minority students learning together in the same classroom.
2) There are different types of bilingual students including balanced bilinguals and various levels of bilingualism depending on a student's native language proficiency.
3) Language transfer occurs when a student's first language influences their comprehension or production of a second language, which can make learning the new language either easier or more difficult.
4) Bi-literacy is the ability to read and write proficiently in two languages. Dual language programs aim to develop