Understanding children’s developmental process of psychology helps understand the training and the treatment mechanisms of Youth Mind Training and Mother Therapy. The psychological development process adopted by the Theory of Mimind may be different from those adopted by conventional fields of psychology and psychiatry. The concept of the process of psychological development is essential in designing and implementing the training and treatment methods of Youth Mind Training and Mother Therapy. 

[The process of psychological development]

- Under age 5 : The phase of survival

- Age 5 to 13 : The phase of adaptation to relationships

- Age 13 to 20 : The phase of formation of self-identity

- Over age 20 : The phase of self-actualization 

Psychological problems occur in teenagers in this phase when the information that does not accord with their thought standards continues to flow in making their psychology unstable. It is necessary to analyze what thought standards are formed in them and add new thought standards or form adequate thought standards to stabilize their psychology. 

Thought standards in boys in this phase are formed to judge information as right ones and wrong ones. Thought standards they already have can be analyzed and then, distorted thought standards can be corrected and changed so that what used to be perceived as wrong information can be changed to right information or vice versa. Then, psychological problems automatically disappear, and adequate thought standards are naturally formed and psychology is stabilized. 

In case of girls, their thought standards are formed to judge information as liked ones and disliked ones. Thought standards they already have can be analyzed and then, distorted standards can be corrected and changed so that what used to be perceived as disliked information can be changed to liked information or vice versa. Then, psychological problems automatically disappear, and adequate thought standards are naturally formed and psychology is stabilized.

In case of children between age 11 and 15, when the phase of adaptation to relationships and that of formation of self-identity may overlap, it must be first determined which phase will be used as the reference point for psychological adjustment. In case of teenagers between age 18 and 29, when the phase of formation of self-identity and that of self-actualization may overlap, it must be also first determined which of the two phases will be used as the reference point for psychological adjustment.