Dealing with ethnic and linguistic diversity is one of the major challenges in today's education. Therefore, the formulation of competencies for teachers and teacher training should take into account the specific requirements of teaching in multicultural schools. In 2002, a series of small-scale studies were conducted to identify and formulate teachers' communicative competencies in multicultural classes through a mixture of instruments and data sources. The studies aimed at providing recommendations for improving these competencies through teacher education and professional development. This study reports on the multiple instruments used to study the practical knowledge and behaviour of experienced teachers in multicultural schools by disc...