Values
1. Speaking Proficiency will improve (including pronunciation)
2. Double investment (killing too birds with one stone)
3. Learners will learn ENglish in L1 context
4. SUbject Knowledge will be more globally used.
5. No more paymetn for extra lesson (no gap between the poor and the rich)
6. Affective filter can lowered.
Pitfalls.
1. Lack of understanding -> Learning failure.
2. Not effective for all students (effective only for motivated student)
3. Not appropriate for all subjects (ex. Korean History)
4. Too costly / Time-consuming
5. No teachers
