This document summarizes a study that evaluated the "New Interchange" English textbook series based on feedback from 35 Iranian EFL teachers. The study found that while teachers generally found the series effective and suitable, it also had some weaknesses. Specifically, most teachers had similar positive opinions about the series' effectiveness, but results showed the series has issues that require teacher awareness and consideration. The study aimed to determine the pedagogical value and suitability of the widely-used New Interchange series from the perspective of Iranian EFL instructors.