Different kinds of naturalism - Naturalism is a widely accepted trend of contemporary philosophy, the analytic tradition in particular. However, the (dis)continuity between philosophy and the sciences is still controversial. In this paper a survey is presented of the different approaches to philosophical naturalism, focusing on the debate between a pluralistic position and a more restrictive one. The latter is well represented by Sandro Nannini’s Naturalismo cognitivo (2007), the best example of "hard" naturalism on the Italian philosophical scene. In contrast with this position, we argue that many genuine philosophical issues, such as the first person perspective of conscious experience and the ontological commitment about social rules, remain "hard problems" for radical naturalism. Keywords: Analytical philosophy, Cognitive science, Hard naturalism, Pluralistic naturalism, Reductionism, Social ontology.