„There is growing evidence that teacher preparation is a powerful predictor of students’ achievement, perhaps even overcoming socioeconomic and language background factors. To engage students in learning, teachers need to be well-prepared such that they have a solid mastery of the content in the subject to be taught and a repertoire of effective pedagogical approaches.“
IEA (Hrsg.), „TIMSS and PIRLS 2011: Relationships among reading, mathematics, and science achievement at the fourth grade“ (2013), S. 114