 Two answers to this difficulty have been proposed. The first allows the existence of dispositional properties in addition to ordinary properties (Clifton 1996). According to the second answer, the outcome 1 of the projector \(\Pi^{\sigma}\) is a collective dynamical effect onto the measurement device (Dieks 1998): the composite quantum system may behave as a collective entity, screening off the atomic quantum systems. This implies that a non-atomic quantum system \(S^{\sigma}\) may sometimes be taken as if it were atomic within a coarse-grained description.