Dynamic assessment is an approach based on sociocultural theory of mind aimed to combine instruction and assessment in which learners' development is simultaneously assessed and improved with regard to their Zone of Proximal Development. This study aimed to integrate principles of dynamic assessment in providing feedback with process-genre approach to teach explanation genre writing. The participants of the study (N=10) were male and female students majoring English translation for BA degree at Chabahar Maritime University. The results of independent samples t-test showed that the learners who were exposed to interactionist approach of DA, performed better than the control group in posttest. Findings of the study suggested that providing feedback through negotiation let students understand their problem and remove them better.