1. The psychological activities of each subject can be perfectly obtained through written or oral answers.
2. The collected data can perfectly get the whole process of psychological development and change of the subjects.
3. Through the psychological activities obtained by the subjects, the psychological activities of the application groups can be perfectly obtained.
4. Applying the psychological activities of groups, we can perfectly draw the rules of group activities and draw conclusions from them.
Perfection cannot be achieved, so to improve universality, we only need to narrow the gap between these aspects and perfection.
The specific method input is too complicated, so I won't describe it here.
Ps The answer to this question is very expensive. If it is written in full text, it is equivalent to an academic paper of a university or even a graduate student. Lz, what do you want to do?