S ummary . The present study made use of Berko's ‘Wug Test’ to investigate the development of morphological rules in children aged from 4 to 14. The results suggest that the main usefulness of this procedure should be between the ages of 4 and 12, approximately. Within this range, most of the rules tested show a steady improvement towards a ceiling value. The two exceptions are derivation and the use of the comparative and superlative which show a slower and later development.
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A 1972 study studied this question.