PS The statement of purpose should be 300-500 words concerning your purpose for undertaking or continuing graduate study, your reasons for wanting to study at Purdue, and your research interests, professional plans, and career goals. You also may explain any special circumstances applicable to your background and elaborate on your scholarly publications, awards, achievements, abilities, and/or professional history. GPA Undergraduate GPA minimum: Admission to the PhD program is quite competitive. Recent admitted students have a typical GPA of 3.5 or higher, and those receiving fellowship, RA or TA have a typical GPA of 3.7 or higher. The minimum recommended GPA to apply is 3.2. CV Resume Fee The Graduate School application fee is $60 (U.S. dollars) for domestic applicants and $75 (U.S. dollars) for international applicants. You must pay your application fee online with your credit card. Visa, MasterCard and Discover cards are accepted and processed using a secured online payment system. Your application will not be processed until your nonrefundable application fee has been paid. RL Recommendation letters three official letters of recommendation. Recommendation letters must be submitted through the on-line application system. We cannot accept recommendation letters through email. If your recommender must write a paper letter, it must be submitted in a sealed envelope with the writer's signature over the flap. Transcript You must provide official transcripts and/or academic records at the request of the graduate program or if you are admitted and choose to enroll. An official transcript bears the original signature of the registrar and/or the original seal of the issuing institution. Official documents should be submitted to: Office of Graduate Admissions Purdue University Graduate School 155 South Grant Street, YONG 170 West Lafayette, IN 47907 詳情見https://www.purdue.edu/gradschool/admissions/how/apply-transcripts.html