  In our previous work, a new approach to the notorious problem of quantum
measurement was proposed. Existing treatments of the problem were incorrect
because they ignored the disturbance of measurement by identical particles and
standard quantum mechanics had to be modified to obey the cluster separability
principle. The key tool was the notion of separation status. Changes of
separation status occur during preparations, registrations and scattering on
macroscopic targets. Standard quantum mechanics does not provide any correct
rules that would govern these changes. This gives us the possibility to add new
rules to quantum mechanics that would satisfy the objectification requirement.
The method of the present paper is to start from the standard unitary evolution
and then introduce minimal corrections. Several representative examples of
registration and particle scattering on macroscopic targets are analysed case
by case in order to see their common features. The resulting general Rule of
Separation Status Changes is stated in the Conclusion.
