Description of scientific fields in secondary education concerning contents and level. PUPILS: background variables: age, sex, country of birth, duration of residence in country, housing situation: number of brothers and sisters, name of occupation of father and mother of pupil, duration of education in years of mother and father of pupil, readership of books / expectations about higher education in the scientific fields, preference for occupation, following lessons in scientific fields, time spend on homework: from specified fields/ report marks, interest in scientific fields, usage of calculators and computers at school / attitude towards: school, lessons, scientific fields, financing, stress, necessity and importance / elements of lessons ( books, practical, topics ) / behaviour of pupil during lessons / six educational tests of knowledge about scientific fields TEACHERS: background variables: age, sex, duration of education in years, readership of books and magazines on own domain, membership of organizations on domain, income / years of practice in teaching, spending of time on work at school and outside school / time spend on courses for teaching scientific fields last year / usage of several teaching methods, working with small groups for discussions and practical / facilities for lessons in scientific fields / paramount motives for determining the contents and topics of the lessons / restrictions in teaching by instances or facilities / in which way are pupils being judged / usage of textbooks / the teachers are asked to estimate the performance of their pupils on the six educational tests SCHOOL: background variables: size of community of residence / nursing area of school / structure of lessons, number of pupils, number of teachers, number of classrooms with facilities for scientific fields, number of laboratory assistants / which decision are made by which ( groups of ) persons or instances / funding of school, annual budget