Focus on form, i.e. brief attention to language items within a larger meaning-focused context (Long 1991; Ellis 2001), occurs in a variety of L2 instructional contexts. Meta-analyses of the effectiveness of focus on form have found overall positive effects; however, these meta-analyses have commented on the small number of studies available for synthetic analyses, particularly when considering the effects of specific characteristics of focus on form (e.g. Norris & Ortega 2001; Russell & Spada 2006; Mackey & Goo 2007). Consequently, this colloquium continued the investigation of specific focus on form variables to further our understanding of why "sometimes focus on form works, and sometimes it does not" (Williams 2005: 685).