This book recounts the ways in which grammatical metaphor (GM) has evolved in SFL theory, discusses the research studies that explored the development of GM in language development and language education contexts, and presents various ways of providing written feedback to English as an additional language (EAL) students drawing on the Sydney School's genre pedagogy and Vygotsky's notion of zone of proximal development (ZPD). As such, it is a valuable resource for linguists, educational linguists, lecturers, and researchers, and will be constructive for language programmers, unit/course designers, teacher educators, language teachers and pre-service teachers.