Principle of objectivity
In psychological research, it is particularly emphasized to be based on sufficient factual materials and avoid the influence of subjectivity.
Development principle
We must study the psychology of preschool children from a developmental perspective, paying attention not only to the psychological characteristics that have already formed, but also to the new characteristics that have just sprouted and their development trends.
Educational principles
Research work will always have a more or less impact on preschool children's psychology, so researchers must be responsible for children's physical and mental development.
Cross-sectional study
Studying subjects of different ages at the same time can collect more data in a short time, but it is not enough to accurately reflect the continuity and turning point of individual children's development.
Longitudinal study
Through the long-term study of the same group of subjects, we can obtain the continuous and staged data of children's development, but it is difficult to maintain the constancy of the sample because of the long period and high cost.
Aggregation crossover study
Combining horizontal and vertical design and comprehensive utilization will help to find out the relationship between individual early development and future children's development.
cross-culture study
By studying children with different social and cultural backgrounds, it is helpful to test, revise and perfect the theory of children's development.