As an educator, providing feedback to the EFL learners is one of the most important issues in the field of education. As a consequence, the educators are searching for the most effective ways of providing feedback to the EFL learners, in order to help them to become more proficient learners in writing. As an educator, if you wish to provide more effective feedback, we recommend you to read this book before providing feedback to your learners. In brief, in order to improve English as a foreign language learners (EFL) writing skills, this study aims to find out the most effective agent that provides IWCF, the impact of the gender factor when receiving IWCF from these different agents and also the participants' perceptions towards the agent that they received IWCF. A quasi-experimental design was adopted in which three classes of EFL learners were employed at a private university's preparatory school.