The author characterizes the model of rationality devised by critical rationalism in opposition to the classic model of rationality and as an alternative to this. He illustrates and criticizes the trichotomous theory of knowledge which, going back to Max Scheler, is received in a secularized version by Habermas and Apel, also under the influence of the hermeneutic tradition of Heidegger and Gadamer and of the so-called “critical theory” of Max Horkheimer and Theodor Adorno. The author criticizes historicism as it expects (...) to be an alternative to naturalism and not to make use of the method based on scientific laws. The author proposes as an example of technological social science the model developed in economics starting from Adam Smith. With regard to legal theories, natural law is rejected because of its sociomorphic cosmology. It is proposed that legal science as social technology has two parts. One part aims at efficient interpretations of valid law (for the space-time region concerned) and a second part aims at the construction of efficient norms for the modification of valid law by legislation. (shrink)