 A prominent attempt to design a theory of intrinsicality in terms of non-disjunctivity that avoids these last two objections is that of Brian Weatherson (2001). In his theory, combinatorial principles of possibility are not used to derive characteristics of individual intrinsic properties, as Langton and Lewis do, but characteristics of the whole set of intrinsic properties. He argues that this set, call it \(SI\), will have the following properties: