“…Research highlights some potential problems inherent in peer response practice and they lie in, Pre -print draft of paper in press for System, 2014 http://dx.doi.org/10.1016/j.system.2014.03.004 4 L2 writers' different attitudes and expectations towards collaboration and pair or group mechanisms (Carson & Nelson 1994 Learners' beliefs about the relative value of teacher and peer feedback (Morra & Romano, 2008;Nelson & Carson, 1998) L2 learners' inability to detect errors, offer valid feedback, and lack of experience and unfamiliarity with peer evaluation technique (Tsui & Ng, 2000) Lack of trust in their peers' writing skills and reservations to each other's advice (Rollinson, 2005;Yang et al, 2006) Failure to achieve the goals of peer evaluation is more likely to happen in contexts where learners have had limited formal exposure to writing skills training and have not yet developed adequate evaluative criteria for good writing. Learning to write on the one hand, and to evaluate on the other, is a dual agenda which may eventually lead to cognitive overload and frustration in novice writers (van Steendam et al, 2010). Therefore, teacher intervention, whether direct or indirect, may be needed at all stages of the writing process particularly when dealing with EFL students at lower levels of proficiency.…”