Abstract
In accordance with the laws of ergodynamics (Venda and Venda, 1994), it has been suggested that, when the condition in a control system goes from a normal situation to an emergency situation, human performance efficiency dynamics should be wave-like, first demonstrating a decrease due to different functional-structures, (normal and emergency), then transform from one to the other. Special emergency experiments were organized and It was found that operators used three different cognitive strategies that transformed from one to the other. This process caused the wave-like dynamics of performance efficiency. Operator's performance efficiency first decreased and, only after cognitive strategy transformations were completed, the efficiency then increased. The processes were then reconstructed and studied at the regional training centers in Krasnoyarsk (Siberia, Russia) and Kiev (Ukraine).
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