which mixed types can occur. Subsystems in the society can belong in different types, as in the case of medieval Europe mentioned earlier. Different groups in the same society can be the object of different types of prejudice. Also, in the case of a society in transition, different segments of the total society (as rural versus urban) can be in different stages in the process of evolution. The isolated rural areas will tend to remain paternalistic longer than the industrial centers, for example. All these possibilities can make the over-all characterization of a total society a complex matter. But again, this does not invalidate the criterion of polarization. It is only a question of defining the boundaries of the social system or subsystem under analysis.