Recent studies on teachers’ effectiveness highlight the importance of multiple perspectives and
methodological approaches in research on teaching and learning (Seidel & Shavelson, 2007). In this
context, indicators of inquiry need to be considered on different levels and for different target groups.
According to the target groups approaches and findings with regard to the three levels: policy and
administrative stakeholders, teacher education and professional development and teachers (and
teaching) as well as students.