The article seeks to explain the relationship between the concept of complexity and the production of the theoretical structure of Niklas Luhmann, therefore, walk by the relationship that now exists between the Natural Sciences and Social Sciences targets and the transdisciplinary nature of the work of the German master, Scoring more shredded the concept of self in this process. The article exposes the complexity initially as a concept that emerges from the hard sciences, and it imposes on them great difficulty. This fact indicates the difficulty inherent in the handling of complexity. From there, for social scientists have remained the task of producing spaces that permit the theoretical handling of the complex, to translate scientific language contradicts the very real and concrete as social itself. Luhmann put the complexity of Hard Sciences within the Social Sciences, admitted in a concrete way that only the complex can reduce complexity. The distributed among all its concepts, then you can say that the complexity models the luhmannian model theory.