Suppose the system is in a state of superposition of two determinate states (of an observable) and has equal probability of getting each determinate state, when observed. An observation forces the collapse of the wave function to either one of the determinate state (say, states A and B). Since the observation is the cause of the collapse, can I say that if I know all the information about the observation/measurement, then I will be able to deduce which state (A or B) the wave function will collapse to? For example, if I toss a fair coin, I will get heads half the time and tails half the time. If I know all the information (the forces on every particle in the system, their mass, temperature, etc. ) in a particular toss, then will I be able to deduce the result of the toss with certainty?