Abstract: The purpose of this survey study was to assess the suitability of the textbook “Summit 2B” for Undergraduate University Students (UUSs) based on two criteria, i.e. subject matter and vocabulary/structure. The study conducted at Tabriz Islamic Azad University and Urmia Jahad Daneshgahi. The participants of the study were 150 including 10 instructors (8 males and 2 females) and 140 students (60 males and 80 females). Two means were used to collect quantitative and qualitative data. First, checklist adopted from Doaud & Celce- Murcia (1979) was given to both instructors and students and the obtained data were analyzed by using SPSS software. Second, instructors were interviewed individually to answer the open-ended questions prepared by researchers. The results of the study revealed that the textbook “Summit 2B” is suitable for UUSs based on the instructors’ and students’ points of views. The findings have implications for ELT material developers, designers, and also for teachers in choosing the proper textbooks in their teaching process.