Those who offers the system points of view, believe that the intelligence is a difficult and complete system. They try to understand generalized whole, consisting and various parts. Two good examples of system theorizing – the theory of human intelligence of Gardner and Shternberg.
It should be noted that changes were not accident. Children with the high social and economic status (SES) had tendency to deduction of IQ at the former level or to its increase. At children with the low social status – on the contrary.
IQ is not invariable size. Honzik, Macfarlane and Allen (194 found out during longityudny supervision that this coefficient is rather inclined to change, than to remain at one level during all human life.