Description of contents and output of instruction of mathematics in secondary schools for international comparison. P0768a: tests of mathematical knowledge / P0768b: pupils questionnaire mathematics as examination subject / time spent compared with other homework / extra help from parents or tutors / use of calculator / knowledge, performance and attitudes of parents / significance, ease and preference of math topics / attitudes regarding many aspects of mathematics / P0768c: teachers questionnaire experience / teaching degree / other school activities / evaluation of test-class on mathematics / time-scheme / use of calculator / time spent on various math topics / use of educational appliances / math books / significance, ease and preference of teaching various math topics / attitudes on various aspects of mathematics / P0768d: opportunity to learn questionnaire / P0768e: geometry questionnaire / P0768f: school questionnaire: general aspects and data on mathematics section. Background variables: basic characteristics/ residence/ occupation/employment/ education