This study aimed at evaluating the textbook used for teaching Arabic for speakers of other languages at the International Institute for Teaching Arabic for Speakers of Other Languages at the University of Jordan from the perspective of instructors who taught the book and the students who studied it. The study aimed at identifying the points of strength and weakness of the book. Moreover, previous studies and textbooks were used to design the instrument of the study, which consisted of eight domains and fifty-seven items after the instrument had proved to be valid. The study tried to find out to what extent the book used the criteria discussed in the previous studies and textbooks mentioned in this study. The sample of the study consisted of thirty teachers and students. To analyze the findings of the study, the averages were calculated. This study found that: (1) The averages of the instructors and students were in the medium level, which implied that the standards in writing educational books were taken care of in a medium way; (2) Generally, the students and instructors' averages were in the medium level, which implied that this book needs to be improved and modified; and (3) There were no statistically significant differences between the instructors and the students in evaluating the book. (Contains 11 tables.)