EN
A proposed theory refers to well-being of individuals estimated by themselves. Subjective well-being (SWB) contains attitudes towards one's own life as a whole and specific domains of own life (e.g. job, health), expressed in emotional and cognitive evaluations. Showing limitations of 'bottom-up' and 'top-down' theories the paper presents main assumptions of the Transactional Model of Subjective Well-being: 1. Emotional and cognitive evaluations are separable; 2. SWB is a system of attitudes; 3. A level of evaluations and relations between them depend on 'person' and 'person-environment' systems. Research on a structure of SWB show that: reactivity modifies causalities between emotional and cognitive evaluations of life, job and health at a new workplace (high stimulation); relations between cognitive evaluations depend on reactivity and a kind of situation (low or high post experience). The findings indicate that the offered theory is valid. New hypotheses and methodological demands for further research are also shown.