  Deontic logic is shown to be applicable for modelling human reasoning. For
this the Wason selection task and the suppression task are discussed in detail.
Different versions of modelling norms with deontic logic are introduced and in
the case of the Wason selection task it is demonstrated how differences in the
performance of humans in the abstract and in the social contract case can be
explained. Furthermore it is shown that an automated theorem prover can be used
as a reasoning tool for deontic logic.
