 Prima facie, RQM may seem to imply a form of perspective solipsism, as the values of variables realized in the perspective of some system \(S'\) are not necessarily the same as those realized with respect to another system \(S''\). This is however not the case, as follows directly from quantum theory itself. The key is to observe that any physical comparison is itself a quantum interaction. Suppose the variable \(A\) of \(S\) is measured by \(S'\) and stored into the variable \(A'\) of \(S'\). This means that the interaction has created a correlation between \(A\) and \(A'\). In turn, this means that a third system measuring \(A\) and \(A'\) will certainly find consistent values. That is: the perspectives of \(S'\) and \(S''\) agree on this regard, and this can be checked in a physical interaction.