Abstract
Sum mary 78 children ranging in age from 4 to 9 years and grouped in 3 age levels solved object identification problems in which the experimenter selected an object from a set collection of objects and allowed subjects to ask questions for which « yes » and « no » answers could be given. Transformation of this game into non-verbal form led to the discovery of three precategorical strategies for the isolation of a unique element. In order of their appearance, these are : successive cumulative scan, successive scan with replacement, successive and systematic scan. These strategies are characterized by their stability from one situation to another. This evolution of search strategies is interpreted in terms of changing task representation and changing capacity for handling negative information.
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