 Perhaps it’s premature to conclude, as Searle does, that there has to be an “internal” difference here. While most theorists treat intention as a psychological attitude (e.g. Davidson 1978, Harman 1976, Bratman 1986), some work on intention influenced by Anscombe and Wittgenstein (such as Wilson 1989 and Thompson 2008) understands intention fundamentally in terms of intentional action (see the entry on intention for discussion). It remains to be seen how Anscombian approaches to shared agency will develop, though some forays into this territory are to be found in Stoutland 1997 and Laurence 2010.