Since the 1980s, metaphor has received much attention in linguistics in general. Within Systemic Functional Linguistics (SFL) the area of 'grammatical metaphor' has become increasingly more important. This volume aims to raise and debate problematic issues in the study of lexico-grammatical metaphor, and to foreground the potential of further study in the field. There is a need to highlight the SFL perspective on metaphor; other traditions focus on lexical aspects, and from cognitive perspectives, while SFL focuses on the grammatical dimension, and socio-functional aspects in the explanation of this phenomenon.