  Several theoretical results concerning event-by-event fluctuations are
discussed: (1) a role of the global conservation laws and concept of
statistical ensembles; (2) strongly intensive measures are introduced; they
give a possibility to study e-by-e fluctuations for physical systems with
volume fluctuations; (3) identity method for chemical fluctuations in a case of
incomplete particle identification; (4) the example of particle number
fluctuations in a vicinity of the critical point.
