a new national secondary school exam known as ENEM (Exame Nacional do Ensino Médio) and the creation of a unified, national university application system known as SISU (Sistema de Seleção Unificada). Candidates in any Brazilian state can now apply for admission into courses available in the SISU system, even if the course of interest is offered by an out-of-state university. Places in any given course within the system are then filled based on the ranking of the applicants in descending order according to their overall grade in the ENEM. The application process is divided into three stages and candidates who fail to get a place in their course/university of interest in a given stage may re-apply either to the same or to a different course/university in subsequent stages. In theory, any Brazilian university, either public or private, is free to join the SISU system and select their incoming freshman class based on ENEM marks. As of today, most public universities have joined SISU, but a few of them, most notably some of the most prestigious federal universities (e.g. UNIFESP, UFRJ, UFMG, UFRGS) have retained their own independent Vestibular exams, on top of the national ENEM, either for admission into all or part of their undergraduate courses. Sometimes the ENEM replaces the old elimination Part I ("primeira fase") of the Vestibular. Alternatively, ENEM results may be used as part of the final overall grade in the Vestibular. More rarely, a few public universities have decided not to use ENEM grades at all and continue to base their admission criteria on the Vestibular only. Notable examples in the latter group include the highly prestigious federal military schools like ITA and IME. Resistance to the ENEM among some top public universities comes mostly from the perception that the national federal exam is less selective/rigorous than the older independent Vestibular. Admission quotas Another important recent development in university admissions in Brazil has been the introduction in most public universities of a quota system in which a certain number of places is reserved a priori to applicants of a certain racial/ethnic background who have completed their pre-university studies in a public (i.e. state-funded) school. Candidates who qualify may apply to a course of interest under the quota system either through the national SISU system or directly at their university of choice (in case that university uses both its independent Vestibular and the national ENEM exam