Teachers are the single biggest influence on student performance. Even though many factors influence student performance, the teacher is still the most important schooling factor. For example, having an effective versus and ineffective teacher has been shown to be equivalent to a class size reduction of 10-13 students [1] and can make the differences of more than a full year’s learning growth. [2]  [1] Rivkin et al, “Teachers, Schools and Academic Achievement”, 2005  [2] Hanushek, “The Trade-off between Child Quantity and Quality.” 1992