W. Ostwald predicted with the formulated by him rule of stages that phase formation processes in complex systems proceed via a discrete series of meta-stable states, which can be formed in a macroscopic form at the given thermodynamic conditions, until finally the most stable phase will be reached. It is shown here that in segregation and crystallization processes in multi-component solutions critical clusters may be formed and evolve via a continuous sequence of states with properties which may differ from the properties of any of the macroscopic phases of the phase diagram. The kinetics of nucleation proceeds hereby via a scenario similar to spinodal decomposition, i.e., via a continuous amplification of density and/or composition differences accompanied eventually by sequential discrete changes of the structure of the system.

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