First, qualitative research methods.
Qualitative research is an activity in which researchers themselves are used as research tools, various data collection methods are used to explore social phenomena in natural situations as a whole, induction is used to analyze data and form theories, and explanatory understanding is obtained through interaction with research objects, so as to construct meaningful behaviors.
Second, the single subject experimental method
Because of the small sample size, high heterogeneity of subjects and the extensive use of behavior correction strategies based on operant conditioning, the single-subject small sample experimental design is an important research method.