 What is then the quantum state in the relational interpretation? It is a mathematical device that refers to two systems, not a single one. It codes the values of the variables of the first that have been actualised in interacting with the second (Groenewold 1957); it therefore codes anything we can predict regarding the future values of these variables, relative to the second system. The state \(\psi\) , in other words, can be interpreted as nothing more than a compendium of information assumed, known, or gathered through measurements, determined entirely by a specific history of interactions: the interactions between the system and a second ‘observing’ system. Understood in this manner the quantum state is always and only a relative state in the sense of Everett (1957). In this sense RQM is “Everettian”; it is so in a different sense than the Many Worlds interpretations, which are based on a realistic interpretation of the universal wave function, rejected in RQM.