“…As WCF is given off-line, unlike oral feedback, which needs to be given during communication and therefore cannot be attended to so easily, it is even more likely to be detected (Bitchener, 2012;Ellis, 2003;Polio, 2012). These theoretical bases help explain why recent studies of written feedback, which have focused on eliminating the methodological problems of earlier studies (identified, for example, in Bruton, 2009;Ferris, 2003), have found evidence for the positive effects of feedback on language acquisition (Bitchener andKnoch, 2008, 2010;Ellis, Sheen, Murakami, and Takashima, 2008;Farrokhi and Sattapour, 2011;Hyland, 2011;Hanaoka and Izumi, 2012;Shintani, Ellis, and Suzuki, 2014;Van Beuningen, De Jong, and Kuiken, 2012).…”