This research will be informed by a qualitative research paradigm and involve an action research case study. It is an action research approach in which I will work collaboratively with one of the English teachers to improve the quality of the EFL teaching and learning process in this vocational higher education institution in Indonesia which is using a TBL program. During the implementation of the TBL, I will explore students' employment of learning strategies as a bounded system (a case) or multiple bounded systems (cases) over time, through detailed, in-depth data collection involving multiple sources of information (Creswell, 2007). Regarding the multiple sources of information, I will use some different instruments of data collection namely questionnaire, one on one interviews, focus group discussions, and document reviews (students' scores of their oral communication skills which is always officially conducted by the teacher every semester, students' learning journals, and teacher's reflective journals).the research participants will be nine second year students of the Business Administration department of the State Polytechnic of Malang. These students are within a range of oral communication skills levels: three students are of the high rank, three are average, and the last three are of low rank. The determination of the students' levels is based on their test scores (final semester scores). Because the first goal of teaching English in this department is developing oral communication skills, then, their final test scores are to measure their oral communication skills. Based on their scores, students who belong to the high rank, middle rank and low rank will be invited to be recruited as the participants of the study. Because this study, in one part, will be a collaborative action research, the class teacher will also be a participant in the study.