An interesting non-decomposable NAKE approximation was proposed by Wasserman and co-workers . It is based on a two-orbital approximation (2OA) that assumes that the electron densities of the active and the frozen subsystem are each two-electron (oneorbital) densities (for which the von Weizsäcker functional is applicable) and that the total electron density is a two-orbital density consisting of a gerade and an ungerade orbital. They showed that after an empirical scaling, such a 2OA performs surprisingly well for rare-gas dimers.