The problem of decision making in uncertain situations is analyzed. The authors analyze behavior strategies in situations with uncertainty of assertiveness - when the subjects are uncertain whether the event will take place, of probable outcomes and factors influencing such behavior. The model of information cascade situation was used to study situations of uncertainty of assertiveness. The results of the research led to the conclusion that the behavior in information cascade situation is related neither with gender personality characteristics, nor with the experience of behavior in a cascade situation. At the same time the relation between the behavior in a cascade situation and the age was revealed: the young students-subjects were more inclined to trust their own information than the adolescents. Finally, the relation between behavior in information cascade situation and sociometric status was found: the subjects who managed to get the largest number of positive choices on the one hand try to get more information in situations with uncertainty, and on the other hand rely on generally held opinion when making immediate decisions.