This study investigates the effect of four types of oral corrective feedback, namely, explicit elicitation, implicit elicitation, explicit recast and implicit recast on the most commonly mispronounced phonological features among Iranian EFL learners through immediate uptake and retention. Five classes were randomly categorized into four experimental groups and one control group, each with 18 intermediate-level male learners. The treatment was conducted in the form of a retelling task in nine

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... sions. During the feedback sessions, the learners' uptake was recorded. The learners' retention was also perused in one immediate and one delayed post-test. The results revealed that those learners who received explicit recast obtained the highest score in terms of correct uptake, and that the groups performed differently across different time periods. The learners' scores enhanced over time; however, the increase then leveled off and even dropped in the delayed post-test in all the experimental groups except for the group which received explicit elicitation, apparently leading to more retention of the target phonological features. The study offers insights to teachers regarding the effect of recast and elicitation in their explicit and implicit form on L2 pronunciation.