This modest work is only an epistemological essay that tries to shed light on the problem of uncertainty in computation and how the predictive dialectic that I have conceived can contribute in a positive way to conceive applicable solutions with the aim of a better mastery of the uncertainty that puts the scientists whose goal is to reach one day the desired precision, on the other hand, predictive dialectics does not mean dialectics for the sake of dialectics, on the contrary, dialectics that can be used for invention, It is for this reason that I have chosen these two examples quoted in the text in relation to reality, one concerning the scientific and technological field, the other, the economic field and more precisely the informal economy and its relation with the quantity of money in circulation whose calculation contains an uncertainty amplified by the weight that represents the informal economy in the economic structure and simultaneously, these two examples opted methodically are distinguished by their complementarity and by their close relation.