 Zeilinger Bruckner: The Relational Interpretation is very close to the view of quantum theory held developed by Zeilinger and Bruckner; in particular, almost identical postulates to the original ones of RQM were independently proposed in (Zeilinger 1999, Brukner &amp; Zeilinger 2003). These ideas generated some of the interesting mathematical work aiming at making the derivation of the formalism of quantum theory from information theoretical postulates precise. For versions of this program strictly related to RQM see (Grinbaum 2005; Höhn 2017; Höhn &amp; Wever 2017).