Corrective feedback has received significant attention in English language teaching, and its role has been highly substantial. Considering the importance of corrective feedback in EFL classes, this study aimed at finding the effects of indirect and gradual CF on Iranian EFL learners' grammatical development and their beliefs toward CF. Twenty EFL learners, meeting the criterion of being lower-intermediate in their proficiency, participated in this study and were divided randomly into two groups of indirect and gradual CF. An Oxford Placement Test, Aljaafreh and Lantolf's (1994) regulatory scale, error correction test, writing tasks, and Corrective Feedback Belief Scale were used as data collection instruments. The indirect group received indirect CF based on cognitive theory and the gradual group received feedback based on Aljaafreh and Lantolf's (1994) regulatory scale for four sessions. The findings obtained from Mann-Whitney U tests revealed that the gradual group which received CF based on sociocultural theory was better able to overcome the problems related to simple present and present progressive tenses than the indirect group which received indirect CF based on cognitive theory. The findings also indicated that all learners, both gradual and indirect, preferred receiving CF and both groups always preferred to be corrected and likewise, both groups considered the teacher as the main provider of CF. The results of this study suggest that gradual feedback based on learners’ ZPD was more effective in improving EFL learners’ grammar development. In conclusion, these findings support the idea that social interaction is a prerequisite for cognitive development.
