Problem solving in pre-operational youngsters.
D000293:Adolescent; D002648:Child; D002652:Child Behavior; D002675:Child, Preschool; D003463:Cues; D005260:Female; D006801:Humans; D008607:Intellectual Disability / Q000523:psychology*; D008297:Male; D011340:Problem Solving; D013647:Task Performance and Analysis