In this paper, we first set out three requirements that each e-theory – a theory whose task is
to explain data – must fulfill in order to be one such good theory: i) an ontological
requirement, i.e. adequate simplicity, ii) a methological requirement, i.e. plurality of
research procedures, iii) an epistemological requirement, i.e. compatibility with the best
available epistemical procedures. Moreover, we will claim that from the metaphilosophical
point of view, unlike scientific naturalism on the one hand and supernaturalism on the
other, liberal naturalism is the only philosophical approach capable of fulfilling all such
requirements.
