Quantitative study of regulation mechanisms of living systems
assumes to take into account the hierarchical interconnection 
of the different involved organization levels, which is not
methodologically designed and is \subjclass{??} met extremely 
seldom in the concrete cases. This clearly emerges when we 
are modelling the regulation mechanisms of cellular communities. 
In spite of great successes achieved by molecular biology, 
genetics and cytology, which allow to build sufficiently 
motivated mathematical models of cellular regulation mechanisms, 
modelling their interconnected activity causes great difficulties. 
In the paper  possible variant of models and the software for 
quantitative study of cellular communities regulation mechanisms 
are discussed.