The aim of this thesis essay is to show that Bayesian confirmation theory can be used instead of the hypothetico-deductive method for all sciences.Føllesdal argues in his paper "Hermeneutics and the hypotheticodeductive method" that the hypothetico-deductive method is used in all sciences, only more or less visible and this paper takes his arguments and applies the same reasoning to Bayesian confirmation theory. To do this, an an example of literature study is gone through where the Bayesian confirmation theory is applied. The cases of confirmation and disconfirmation from the hypothetico-deductive method are worked through in terms of Bayes' theorem and the conclusions are that Bayesian confirmation theory can be used with respect to all sciences and that it might prove even better since its higher adaptability.