 The flash ontology of RQM seems to raise a difficulty: what determines the timing for the events to happen? The problem is the difficulty of establishing a specific moment when, say, a measurement happens. The question is addressed in Rovelli (1998), observing that quantum mechanics itself does give a (probabilistic) prediction on when a measurement happens. This is because the meaning of the question whether or not a measurement has happened is to ascertain whether of not a pointer variable \(O_A\) in the observing system \(S\) has become properly correlated with the measured variable \(A\) of the system \(A\). In turn, this is a physical question that makes sense because it can be posed empirically by measuring \(A\) and \(O_A\) and checking if they are consistent.