ZhaoHong Han is Professor of Language and Education at Teachers College, Columbia University. Her research interests include second language learnability, second language teachability, and their interface. Among her recent publications are Complexity Theory and Language Development (co-edited with Lourdes Ortega, John Benjamins, 2017), Studies in Second Language Acquisition of Chinese (Multilingual Matters, 2014) and Linguistic Relativity in SLA (co-edited with Teresa Cadierno, Multilingual Matters, 2010).

• 1. ZhaoHong Han and Jing Liu: Profiling Learner Language from a Complex Dynamic System Perspective: An Introduction2. Yuan-Yuan Meng: A Dynamic View on Morphosyntactic Accuracy and Complexity in Dyadic Interaction3. Natalia Saez: A Dynamic View on Prepositions, Modal Auxiliaries and Metaphorical Functions In Dyadic Interaction4. Heidi L. Banerjee: A Dynamic View on Advice Giving in Dyadic Interaction5. Vanessa Sheu: A Dynamic View on Relational Propositions in Dyadic Interaction6. Farah Akbar: A Dynamic View on Topic Management in Dyadic Interaction7. ZhaoHong Han: Researching CDST: Promises and Pitfalls

Unlike most other collections, this book consists of a series of articles that draw on data from the same macro context. This gives a uniformity to the book that is rare in collections and very welcome. It makes a noteworthy contribution to the study of Complex Dynamic Systems and offers some important suggestions about how research in this area can move forward. I congratulate ZhaoHong Han on assembling such an interesting volume.

ZhaoHong Han is Professor of Language and Education at Teachers College, Columbia University. Her research interests include second language learnability, second language teachability, and their interface. Among her recent publications are Complexity Theory and Language Development (co-edited with Lourdes Ortega, John Benjamins, 2017), Studies in Second Language Acquisition of Chinese (Multilingual Matters, 2014) and Linguistic Relativity in SLA (co-edited with Teresa Cadierno, Multilingual Matters, 2010).

• 1. ZhaoHong Han and Jing Liu: Profiling Learner Language from a Complex Dynamic System Perspective: An Introduction2. Yuan-Yuan Meng: A Dynamic View on Morphosyntactic Accuracy and Complexity in Dyadic Interaction3. Natalia Saez: A Dynamic View on Prepositions, Modal Auxiliaries and Metaphorical Functions In Dyadic Interaction4. Heidi L. Banerjee: A Dynamic View on Advice Giving in Dyadic Interaction5. Vanessa Sheu: A Dynamic View on Relational Propositions in Dyadic Interaction6. Farah Akbar: A Dynamic View on Topic Management in Dyadic Interaction7. ZhaoHong Han: Researching CDST: Promises and Pitfalls

Unlike most other collections, this book consists of a series of articles that draw on data from the same macro context. This gives a uniformity to the book that is rare in collections and very welcome. It makes a noteworthy contribution to the study of Complex Dynamic Systems and offers some important suggestions about how research in this area can move forward. I congratulate ZhaoHong Han on assembling such an interesting volume.

ZhaoHong Han is Professor of Language and Education at Teachers College, Columbia University. Her research interests include second language learnability, second language teachability, and their interface. Among her recent publications are Complexity Theory and Language Development (co-edited with Lourdes Ortega, John Benjamins, 2017), Studies in Second Language Acquisition of Chinese (Multilingual Matters, 2014) and Linguistic Relativity in SLA (co-edited with Teresa Cadierno, Multilingual Matters, 2010).

• 1. ZhaoHong Han and Jing Liu: Profiling Learner Language from a Complex Dynamic System Perspective: An Introduction2. Yuan-Yuan Meng: A Dynamic View on Morphosyntactic Accuracy and Complexity in Dyadic Interaction3. Natalia Saez: A Dynamic View on Prepositions, Modal Auxiliaries and Metaphorical Functions In Dyadic Interaction4. Heidi L. Banerjee: A Dynamic View on Advice Giving in Dyadic Interaction5. Vanessa Sheu: A Dynamic View on Relational Propositions in Dyadic Interaction6. Farah Akbar: A Dynamic View on Topic Management in Dyadic Interaction7. ZhaoHong Han: Researching CDST: Promises and Pitfalls

Unlike most other collections, this book consists of a series of articles that draw on data from the same macro context. This gives a uniformity to the book that is rare in collections and very welcome. It makes a noteworthy contribution to the study of Complex Dynamic Systems and offers some important suggestions about how research in this area can move forward. I congratulate ZhaoHong Han on assembling such an interesting volume.