Table 3 Overall research design
| Â | Control group class A | Experimental group class B | |
|---|---|---|---|
Stage 1 Preparation | Week 1 | Pre-performance test I on listening, reading, and writing | |
Stage 2 Treatment* | Week 2 | Traditional teaching of unit 1 | Quizlet-based teaching activities of unit 1 |
Week 3 | Traditional teaching of unit 2 | Quizlet-based teaching activities of unit 2 | |
Week 4 | Traditional teaching of unit 3 | Quizlet-based teaching activities of unit 3 | |
Week 5 | Traditional teaching of unit 4 | Quizlet-based teaching activities of unit 4 | |
Week 6 | Traditional teaching of unit 5 | Quizlet-based teaching activities of unit 5 | |
Week 7 | Traditional teaching of unit 6 | Quizlet-based teaching activities of unit 6 | |
Stage 3 Data collection | Week 8 | Post-performance test II on listening, reading, and writing | |