[New paradigms in human sciences].

In this paper, the author describes the jump of paradigm in Human Sciences the conceptual model introduced by G. Bateson implies inasmuch as it shifts emphasis from the analysis of facts to formal organization of reality, and defines 'mental' as a concept which comprehends an organism with relation to its surroundings. The author reviews the main ideas Bateson extracted from both the systems theory and cybernetics in order to outline his 'ecology of human mind'. The complexity of psychosocial processes, however, requires no such mechanical models--i.e. 'less mechanical' ones--to explain time as a continuum in which changes in human systems occur, for instance. Thus, systems dynamics and recursivity models including a multiplicity of feedback loops contribute with some useful constructs. Finally, some ideas developed within 'hard sciences', applied to Social Sciences to integrate the complexity of the goals are also discussed.