the edition of the programme for international student assessment pisa oecd a points to three key aspects of the institutions that regulate secondary education that play a part in reproducing inequalities of origin hindering the equalizing role that guides the education system first the teacher assignment mechanism has the dual effect of sending a revolving door of young and inexperienced teachers to schools in unfavourable sociocultural contexts as well as concentrating teachers with more experience in schools in favourable contexts second the geographybased system for assigning students to schools reproduces the residential segregation process