Qualitative research always has to deal with the methodical problem how to come to 'objective' and 'reliable' predications about social reality. In the course of time several principles of methodical control has been developed like 'grounded theory', 'circularity of the process of research', 'triangulation', 'plurality of interpretations', 'case contrasting' and so on. However these approaches implicate an underlying assumption which seems to be problematic: in eliminating the 'deficiency' of the qualitative researching process they aim at a homogenous, coherent, fixed sense of the data.In my presentation I want to ask if qualitative research may offer an alternative approach to social reality. My starting point is the fact, that the subject is not available and transparent for itself. It is never able to catch up with its own acts of talking, thinking and acting. This entanglement of the subject in the 'historical Apriori' (Michel Foucault) is unavoidable. Hence, if one assumes to grasp 'social reality', one gets only a difference which stays indefinite. And subjects, in their trials to build their relations to world and to themselves, are always pushed to that uncertainty of being. To complicate things, one has to put into consideration that the uncertainty of being is effective for the researcher too. Every interpretation of the data is bound to conditions which can neither be controlled nor overlooked. It is therefore necessary to discuss the consequences of this unavoidable uncertainty concerning the possibility of a methodically based qualitative research: What does it mean for the data, that the 'objects' of my research can't catch up with their own acts? How can I deal with the fact, that my interpretations are not really mine? And how can I consider the ethical implication, that my efforts to get a homogenous sense might violate the data?Referring to Alfred Schäfer I want to suggest an access to Empiricism which resigns to define the matter in advance. Instead it takes the 'indefinable' itself as a starting point for research. Foucault, Michel 1972: Archeology of knowledge, Routledge Lüders, Jenny 2007: Ambivalente Selbstpraktiken. Eine Foucault'sche Perspektive auf Bildungsprozesse in Weblogs, transcript Schäfer, Alfred 2004: Bildungsforschung: Annäherungen an eine Empirie des Unzugänglichen, Vortragsskript Schütz, Alfred 19734: Collected papers, vol. 1: The problem of social reality, Nijhoff