In Trinidad and Tobago students are assigned to secondary schools after fifth grade based on achievement tests, leading … to large differences in the school environments to which students of differing initial levels of achievement are exposed … differences by assigning the weakest students to schools that provide the least value-added …

Existing studies on single-sex schooling suffer from biases because students who attend single-sex schools differ in … unmeasured ways from those who do not. In Trinidad and Tobago students are assigned to secondary schools based on an algorithm … coeducational school. While students (particularly females) with strong expressed preferences for single-sex schools benefit, most …