The empirical status of the formal operations.
D000293:Adolescent; D000367:Age Factors; D001076:Aptitude; D002657:Child Development; D003071:Cognition; D003479:Curriculum; D005260:Female; D006801:Humans; D007360:Intelligence; D008297:Male; D011581:Psychological Tests; D011582:Psychological Theory; D011588:Psychology, Educational; D012737:Sex Factors; D013850:Thinking