1. Language as a by-product of learning about real-world content

2. People learn a second language more successfully when they use the language as a means of acquiring information
The curriculum-organizing principle is subject matter, not language.
Students are tested on content, not language
Students will not be tempted to review their grammar and
memorize long lists of vocabulary words, but rather will listen closely to lectures, participate in discussions, do topic-related readings, and acquire a great deal of language in the process (Krashen 1991).
The focus is always on meaning, not form.

3. Teacher’s role in CBI
In CBI, native speakers of the L2 are generally excluded from the classroom, which ensures that instructors will speak at a language level comprehensible to the non-native speaker.
Instructors make speech adjustments, and also make use of facial expressions, gestures, and body language to help make input more comprehensible. They rely extensively on graphic organizers.
They sometimes provide students with readings in their native language for background knowledge. Such a sheltered environment is conducive to a lowering of the affectivefilter (Krashen 1985a, 1985b).

4. Theme-based Courses (TB)
TB courses do have explicit language aims which are usually more important than the content learning objectives.
It is a language teacher, and not a subject specialist, that is responsible for teaching content.
Students are taught subject matter, but they are tested on
language and get course credit for that only.
In the continuum of CBI (Brinton, Snow and Wesche,1989), TB
courses would constitute the weakest representation of CBI
models.
Usually found in EFL contexts

5. Adjunct/Linked Courses (AL)
A specially designed language course + a regular academic course
The content instructor---academic concepts
The language teacher--- the students’ academic needs
Language skills using the academic content (revising notes, writing assignments, preparing for tests)
Native speakers in the content class

6. Sheltered subject-matter instruction (SSM)
Overall purpose is content learning rather than language learning (one of the “strong” paradigms within the general framework of CBI)
Learners who have been segregated or ‘sheltered’ from native speakers”
Commonly taught by a content instructor, not a language teacher
The content instructor has to be sensitized to the students’ language needs and abilities, and has to be familiarized with the traits of the language acquisition process.

7. Second language medium courses (SLM)
The strongest version within the framework.
Without specific instructional emphasis on language analysis and practice, and without making adjustments to adequate the discourse to the level of proficiency of students.
Students---above intermediate level, at least, with respect to listening and reading comprehension
Not always strictly considered as a model in CBI

8. Q: What are the advantages and disadvantages?

9. The focus on meaning in CBI prevents the development of accuracy
Objection 1
The focus on meaning in CBI prevents the development of accuracy
in the target language.
Objection 2
Language in CBI is “functionally restricted.”
Predominance of academic language over nonacademic language.
In content-based programs, adolescents resort to vernacular in the first language when engaging in peer-peer social interaction(Tarone and Swain, 1995)

10. Suggestions Sheltering language and content in CBl courses is a must.
Use of readings in the students’ native language to provide background knowledge (see, e.g., Klee and Tedick 1997; Leaver 1997; Sternfeld 1992, 1993, 1997).