 As mentioned above, it has recently come into question whether a formal rendition of Lewis’ definition as the one given above adequately represents all facets of Lewis’ approach. Cubitt and Sugden (2003) argue that it does not, their critique hinging on a feature of Lewis’ analysis that is lost in the possible worlds framework, namely the 3-place relation of indication used by Lewis. The definition of indication can be found at pp. 52–53 of Convention: