Getting insight into the opinion of teachers at secondary schools about the "middenschool": integrated education for pupils aged 12-16. Career as a teacher / how was r. informed about "middenschool" / consequences of relations and, or differences between talents / motivation / achievements, social class and level / quality and differentiation in teaching / different ways of integrated education / contents of education / importance of different subjects / necessity of vocational subjects / extension of school age / preferred way of teaching and organization of school / who should decide about school system / goals of school education / task of teacher / methods of teaching / psychology of pupils / relation to teacher. Background variables: basic characteristics/ occupation/employment/ social class