vast differences in size of group systems
Their average parameters, comprising about 8 - 10 thousand km2, may deviate in the direction of decreasing or increasing the size depending on the situation. The calculated area can be changed in most cases, from 6 to 12 km2. These changes in the functional-spatial attitude must be "compensated" with special structural framework for their planning organization, creating the preconditions for the entire population of the benefits of socio-economic integration within the system.
The range of differences in the size of group systems are often caused by uneven intensity of the development of various sectors of the zone of influence of large cities, in many cases lack of sufficient socio-economic potential of urban centers, capable of leading the group form of settlement in adjacent territories, significant difference between the sizes of administrative regions - from 1 thousand km2 in areas of intensive urban development in European countries to 10 km2 for the resettlement areas of large cities, mainly in Siberia and the Far East.
In areas with a high level of fragmentation and a small area of вЂ‹вЂ‹administrative areas, conditions are added to highlight the more compact group systems with a relatively symmetrical with respect to the city center boundaries. Conversely, in situations where the group system is composed of about one to three large administrative districts, the boundaries of her can be strongly biased as compared with the theoretical and the largest city in contrast to occupy an eccentric position. Taking into account the interests and benefits of the system development of settlements for a number of situations can be raised on a partial retreat from the established administrative boundaries and their adjustment.