A range of studies have investigated whether certain types of written corrective feedback or combinations of different types are more effective than others. These studies have most often categorized feedback as either direct (explicit) or indirect (implicit). Direct corrective feedback may be defined as the provision of the correct linguistic form or structure by the teacher to the student above the linguistic error (Ferris, 2003). It may include the crossing out of an unnecessary word/phrase/morpheme, the insertion of a missing word/phrase/morpheme, or the provision of the correct form of structure. Additional forms of direct feedback may include written meta-linguistic explanation (the provision of grammar rules and examples at the end of a student’s script with a reference back to places in the test where the error has occurred) and spoken meta-linguistic explanation (e.g. a mini-lesson where rules and examples are presented, practiced and discussed; one-on-one individual conferences between teacher and student or conferences between teacher and small groups of students). On the other hand, indirect corrective feedback is that which indicates that in someway an error has been made without explicit attention drawn (Ferris, 2003). This may be provided in one of the four ways: underlining or circling the error; recording in the margin the number of errors in a given line; or using a code to show where the error has occurred and what type of error it is (Ferris and Roberts, 2001); Robb et al., 1986). Rather than the teacher providing an explicit correction, students are left to resolve and correct the problem that has been drawn to their attention.