SUMMARY
Teacher-led collaborative modeling can provide a condition through which the teachers and learners cooperate, negotiate, discuss, and provide different degrees of support to compose and edit written texts. The presupposition in this study was that this type of modeling can improve the writing ability of the EFL learners as well as their self-regulation in writing. To test the main hypotheses of the study, eighty five female upper-intermediate EFL students studying English as a foreign language at the Ayandehsazan Language Institute (A.L.C) in Torbat-e- Heydarieh , Iran, ranging in age from 14 to 20 sat for the Quick Placement Test (QPT) and 50 students were selected based on their scores on the QPT test. They were divided into two groups. The learners in the experimental group received instruction according to the stages of instruction using collaborative modeling. The participants in the control group, on the other hand, didn’t receive any collaborative modeling instruction. The participants in both groups sat for the writing test as well as a self-regulation test for writing. The results revealed that the experimental group outperformed the control group concerning their writing performance. However, there was no significant difference between the self-regulation ability of the participants in these two groups. The findings of the study have implications for pedagogy as well as research.