Writing development has been a key area of research in applied linguistics. Using a systemic functional grammar, this book outlines developmental changes in writing in three major areas of the school curriculum - English, history, and science - as children move from early childhood to late childhood and on to adolescence and adulthood. School Discourse is an invaluable resource for teachers working with primary and secondary students in educational institutions where the medium of instruction is English. Not only does the book present what genre types students are supposed to make meaning with but it also projects the trajectory of writing development across developmental phases. This might also have implications for improving writing programmes in institutions of higher education, where instruction builds on what has been covered in primary and secondary schools.