 The early presentations of RQM were formulated in the language of information theory (Rovelli 1996). The quantum state is a way of coding the information that an observing system \(S'\) may have about a quantum system \(S\), relevant for predicting future ways \(S\) can affect \(S'\). This information is determined by the ways \(S\) has affected \(S'\) in the past. The hope was raised in Rovelli (1996) that a full reconstruction of the quantum formalism on the basis of simple informational postulates was possible. Two main postulates were proposed: