Innovators' dilemmas: recontextualizing science and technology education; Recent developments in primary and lower secondary school science; The teaching of mathematics in primary and secondary schools; Community development through biology teaching; Biotechnology and its educational implications in school biology; The teaching of chemistry in different parts of the world; Difficulties in concept formation; Towards a practical physics: experiments that can be done at home and in other out-of-school situations; Applications of calculators and computers in science and mathematics education; Science, technology and society: educational implications; Science, technology and society courses: problems of implementation in school systems; The activities of pioneer centres in the USSR; Stimulating innovation at the international level: UNESCO's role in science and technology education.