The status of thermodynamical approach in the multiple production processes and especially for very high multiplicity (VHM) domain is discussed. This approach is quite popular in the heavy ion collision physics. It is argued that the ``principle of vanishing of correlations'' must be used for quantitative estimations of the rate of thermalization. A review of present experimental information is offered.

PACS numbers: 12.38.Mh, 12.40.Ee, 13.85.Hd