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The present paper generally reviews the history of second language (L2) researchers’ efforts in an attempt to find such an index and the possible reasons for the difficulties in establishing the developmental index from both the theoretical and the empirical viewpoints. Two contradictory views—interlanguage theory and emergentism—can finally reconciled so as to have a comprehensive view of second language acquisition (SLA) process.</p

Interlanguage Theory and Emergentism: Reconciliation in Second Language Developmental Index Studies