Selection or classification of students for schools, classes, or other educational programs based on differences in ability or achievement.
The field of education is confronted with widely varying forms of demand and target groups. The massive spread of education is a reality, no less in the North than in the South, even though school enrolment rates sometimes still differ very markedly. Unification of the formal arrangements for basic education has also tended to diversify school intake and to make the task of teaching in most schools more complex. In this context, ability grouping in schools may seem an option based on a fairly rational organizational approach (Gamoran et al., 1995) and on the educational assumption that, by grouping similar students together, it will be easier to ensure that their needs are properly met (Dupriez, 2010: 24).