Abstract This study examined the developments of childern's use of 2 judgement strategies: (1) the use of baserates and (2) the use of the respectiveness heuristic. Childern in the first (M= 6.85), third (M= 8.86), and sixth grades (M= 11.27) and a comparison sample of college students (M= 20.11) made judgements about scenarios that varied by domain (social vs. object judgements) and by information provided (baserates only vs. baserates and individuating information). Results indicated that although the use of baserates and the representativeness heuristic increased with age, the use of individuating information to make social judgements developed quite early. Consistency between subjects' choices and rationales increased significantly with grade level, indicating that younger childern use idiosyncratic strategies, such as personal preferences or scenario embellishment, to make decisions. Developmental trends are discussed in light of previous research with adults.
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