The Rtli school in the Berlin suburb of Neuklln has had to call in the police to control student violence and ensure that weapons are kept out of the school grounds. School psychologists and social workers have also been brought in to help. Germanys three-tiered school system, which separates successful students from under-achievers at an early age, has come under fire for consigning many to less academic secondary schools. However Rtli headmistress Brigitte Pick feels that the roots of the problem lie in the district of Neuklln, which she says is becoming a ghetto. Neuklln is a multi-ethnic area where rents are low and unemployment is the highest in the city.