Purpose: The purpose of this paper is to investigate and compare the effects of group-to-whole student-led oral discussion and small-group collaborative drafting as pre-writing tasks on Iranian intermediate English as a foreign language (EFL) learners' writing performance. Additionally, the difference between the writing components was examined. Design/methodology/approach: To achieve these objectives, a group of 120 intermediate EFL learners participated in a pretest-posttest study in which they were randomly assigned into two experimental groups and one control group. The students in all three groups were tasked with writing a textbook evaluation report for the pretest and posttest. The pre-writing process in the first experimental group consisted of a group-to-whole student-led oral discussion, while the second experimental group engaged in small-group collaborative drafting. Findings: The results indicate that both pre-tasks were effective in improving the participants' writing skill, while collaborative drafting was even more efficient. Furthermore, it was observed that more writing components improved through collaborative drafting. It is concluded, therefore, that the social atmosphere created through oral discussion and the scaffolding resulting from collaborative drafting can help in writing improvement. Research limitations/implications: The findings herein can have implications for first language (L1) composition instruction and second language (L2) writing teaching and, thus, underscoring the utility of the social constructivist approach to writing instruction. Originality/value: As there has been no study conducted to explore the effects of group-to-whole student-led oral discussion on EFL learners' writing skill and to compare its impacts to those of small-group collaborative drafting, the results of this study fill this gap in the literature.