“…Mackey and Gass (2011) distinguish between observational studies in which discourse-level events constitute the unit of analysis (interactionist studies) and those whose unit of analysis includes tasks and instructional practices (instructional segment studies). The interactionist studies have resulted in the creation of various observation schemes used to identify and characterize critical features in classroom discourse such as corrective feedback (e.g., Chaudron, 1977;Lyster & Ranta, 1997), form-focused pedagogical episodes (e.g., Ellis, Basturkmen, & Loewen, 2001;Loewen, 2003;Simard & Jean, 2011;Yuqin Zhao & Bitchener, 2007;Zyzik & Polio, 2008), question types (Long & Sato, 1983), turn allocation (Seliger, 1977), and L1 and L2 language use (Duff & Polio, 1990;Polio & Duff, 1994). The objective of the studies observing instructional segments, on the other hand, has been to elaborate observation instruments used to create a coherent and rational portrait of the complexities of the L2 classroom (e.g., Allen, Fröhlich, & Spada, 1984;Fanselow, 1977;Mitchell, Parkinson, & Johnstone, 1981;Ullman & Geva, 1984).…”