Definition of self-system in US English:

self-system

noun

Psychology
  • The complex of drives and responses relating to the self; the set of potentialities that develop in an individual's character in response to parental and other external influences.

    as modifier ‘internal self-system characteristics interact with external demands of the environment to reveal individual differences in behavior’
    • ‘The social aspect of the model implies that the self-system is embedded in a social context that includes the individual and the individual's interactions and relations with the task and with others in the situation.’