  The problem is that in the orthodox theory, the notions of measurement and the time, duration and nature of state collapses remain completely unspecified. As John Bell (1987b, p. 205) remarks, the collapse postulate in this theory, i.e., the postulate that dictates that in measurement interactions the entangled states of the relevant systems do not follow the Schrödinger equation but rather undergo a collapse, is no more than ‘supplementary, imprecise, verbal, prescriptions.’