The present study has two objectives. First, it presents a fundamental hypothesis: the configuration of knowledge represents a determinant factor of many social facts. The entire structure is based upon the dichotomy certainty/uncertainty. Inside it we differentiate between irreducible certainty and reducible certainty. If we accept this typology, some very important arguments may be made and other explanatory opportunities may be created. Finally, we present an analysis which proves that the certainty/uncertainty situation generates different strategic options for social actors. Secondly, we propose an exercise for constructing a theory. To dramatize it, we present some so-called Propositions that are actually logically deduced hypotheses from the initial model. This endeavour should be viewed more as a challenge. I am convinced that sociology should, at this time, give more credit to building theories.