R1 means the survey of students' topic of interest, and the first data collection
01 means the development of unit (lesson) one, the first oral presentation, and students' assessment by using a minute paper, teacher's observation, and evaluation
R2 means the second data collection from the results of the first oral presentation project.
02 means the development of unit (lesson) two, the second oral presentation, and students' assessment by using a minute paper, teacher's observation, and evaluation R3 means the third data collection from the results of the second oral presentation project.
03 means the development of unit (lesson) three, the third oral presentation, and teacher's observation, and evaluation
R4 means the fourth data collection from previous results of the third oral presentation project.
* Each step of this research and development was explained in data collection section.