In 2009 Eric van ’t Zelfde became director of one of the worst schools in Rotterdam. A school with only 34 new student registrations, dramatic exam results, tired teachers and crime. Van ’t Zelfde tackled the problems off the beaten track. No less than 56 teachers left, 34 of whom in his first year as director. He introduced the ingenious rule of conduct ‘you behave yourself’, which is brilliant in its simplicity. He expelled a number of students against the law and had to answer to the judge. After several years, his school began to score at or above the national average. From the worst school in the Netherlands to one of the best schools in the Netherlands in five years.