“…The importance of syntactic complexity in second language (L2) writing research and pedagogy has long been recognized, as evidenced in the large number of studies that have examined the relationship of syntactic complexity in L2 writing to L2 proficiency (e.g., Ai & Lu, 2013;Lu, 2011;Norrby & Håkansson, 2007;Ortega, 2000Ortega, , 2003Stockwell & Harirington, 2003;Vyatkina, 2013;Wolfe-Quintero, Inagaki, & Kim, 1998) or the quality of L2 writing (e.g., Taguchi, Crawford, & Wetzel, 2013;Yang, Lu, & Weigle, 2015) over the past two decades. Results from such studies have shown that some measures of syntactic complexity may be reliably used to differentiate levels of L2 proficiency, and some to predict the quality of L2 writing.…”