 Bratman (especially in his 2014 book, but see also his 2009c, 2009b, 1992) defends a reductive account of this normative requirement, explaining this interpersonal normative constraint in terms of the norms of commitment governing individual intention, such as those of consistency and means-end coherence. Your intentions and plans pertaining to our J-ing have an authority for me because of what might be called a bridge intention to mesh my J-related plans and intentions with yours. Bratman expresses the bridge intention in terms of the condition requiring each participant to have the intention to act in accordance with and because of the others’ intentions and plans (as well as his or her own). Bratman’s idea is that, given my bridge intention, the norms of consistency and coherence governing my individual intentions will be recruited to require that I form my plans and intentions with an eye toward consistency and coherence with your plans and intentions. Roth 2003 sympathizes with these interpersonal normative requirements of consistency and coherence as a condition for shared intention and action, but resists the reductive bridge intention account of it.