 On the weakest logic characterized by such neighborhood models (the minimal “classical modal logic”, E), only \(\OB\)-RE is valid. Additional validities and rules can be obtained by imposing specific conditions on the neighborhood functions. Furthermore, neighborhood semantics can be naturally generalized to deal with conditional obligations (Chellas 1974, 1980), and combined with semantic accounts of related concepts such as agency and ability (McNamara 2019). It can also accommodate conflict-tolerant logics, as we will see next.