“…Using the methodologies of propensity score matching, panel data analysis, and DID, the authors find that 9 th graders in full-time schools showed no significant differences in proficiency (using the state system of external evaluation, SARESP) and pass rates in comparison to those who attended traditional schools. 16 Pereira (2011), Mendes (2011) and Almeida et al (2016) have evaluated the federal program "More Education", responsible for supporting states and cities in their intent to increase the number of school hours to at least 7 hours a day in public elementary, middle, and high schools in the capitals, in other cities of the nine Brazilian metropolitan areas, as well as in other cities with more than 90,000 inhabitants. Pereira (2011) uses DID methodology, designating the elementary and middle schools that had participated in the program in 2009 as the treatment group and the elementary and middle schools that only joined the program in 2010 as the control group.…”