The author considers one of the key points of "subjective theory" - "conditions of objective knowledge are within the knowing subject; there is no knowledge that is independent of the subject, for all the known first be analyzed in terms that make up its meaning. "This thesis the author presents a historical perspective (from Husserl to Luckman), in the process of constitution and intersubjectivity, in the context of the study of the life-world and relate the "natural attitude" with "theoretical" one.