re: Should teachers be paid on student performance?

The issue is and always will be the highly migratory nature of some of public schools’ lowest performing students.

Many tend to bounce from school to school, district to district, yet their test scores are “counted” towards their most recent teachers/schools—despite having just moved into said areas.

In other words, a discrete student’s test scores—negatively or positively—don’t necessarily reflect on a particular teacher, yet they are viewed as such.