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A modified Beltrametti-Cassinelli-Lahti model of measurement apparatus thatsatisfies both the probability reproducibility condition and theobjectification requirement is constructed. Only measurements on microsystemsare considered. The cluster separability forms a basis for the first workinghypothesis: the current version of quantum mechanics leaves open what happensto systems when they change their separation status. New rules that close thisgap can therefore be added without disturbing the logic of quantum mechanics.The second working hypothesis is that registration apparatuses for microsystemsmust contain detectors and that their readings are signals from detectors. Thisimplies that separation status of a microsystem changes during both preparationand registration. A new rule that specifies what happens at these changes andthat guarantees the objectification is formulated and discussed. A part of ourresult has certain similarity with 'collapse of the wave function'.

Quantum measurement problem and cluster separability