This occurs in Singapore, for example- one of the most successful countries on the PISA tests. Tracking is based on the belief that students are not in with identical ability. Because they are not exactly the same, he belief is that the best students will be bored, and weak students will have difficulty in the same class, with the same subject. In Singapore, students in the"special" group go on to the university. "express" students become clerical works. "normal" students become sales people and road sweepers. however, in Finland, another of the most successful countries on the PISA tests, educators do not separate students into different groups or school. instead, different types of learners study together. students who do well and achieve success serve as good examples for other students who aren't doing so well. clearly, tracking works well in some countries but not others.