ElieMeca

Dear all, I am new to this site, and I am an international student. I was recently accepted for PhD studies with full funding in a US university (which is ranked in top 10 in Mech Eng.). I am definitely interested in this university and in the proposed offer, however, since I applied to many universities in Dec. 2015, I prefer to wait for the other universities before taking my final decision. Is there in general a deadline to accept/refuse an offer ? (I did not receive any deadline yet by this university). Furthermore, I have read on the internet that 15 April is a general deadline for graduate schools ("Students are under no obligation to respond to offers of financial support prior to April 15", as mentioned in CGS website). To how extent this is true ? Also, do all the universities (private/public) respect this deadline, or some of them may give a sooner deadline ? Moreover, some of the universities to which I have applied may answer me in February or March. In this case, is it OK to keep the university in which I was accepted at hold for some weeks so that I can receive the other decisions/offers ? Are there in general any recommendations for such situations ? Thank you very much, Elie.