The Sistema de Seleção Unificada (English: Unified Selection System - SiSU) is a digital platform launched in January 2010 and developed by the Brazilian Ministry of Education (MEC).
During the day, it is open for students to select and change their preferences and closes for a two-hour period in the evening to process the ranking.
[32][30] Application to SiSU is available in three ways:[33] In 2013, Oscar Costa Filho, a prosecutor from the Federal Public Prosecutor's Office in Ceará, filed a lawsuit in the Federal Court against the Ministry of Education to ensure that people with disabilities are guaranteed vacancies at higher education institutions that use SISU.
[40][41] The SiSU website began operating on January 29, 2010, and has received criticism for its instability and slowness from students and the media ever since.
Access problems and slowdowns reoccurred in 2011, which required a judicial decision to force the MEC to extend the registration deadline.
In 2013, in another incident, candidates had access to test scores, cell phone numbers and the e-mail addresses of other applicants through the support function.
Until 2015, users had to provide the e-mail address or cell phone number used when registering for ENEM in order for a new password to be created and sent to them by one of these means.
After the change, CPF, mother's name, residence and date of birth were enough for the system to accept a new password provided by the user.
As this information is often publicly available, some students have been victims of vandalism, with their accounts hacked and course options changed by others.