Multimedia has had a widely recognised impact on society, but it is still under-represented in the literacy pedagogies of many schools. This may relate to the way we view assessment for literacy, which is still almost wholly monomodal. Students assessed at a low level as producers of verbal text may respond positively when working multimodally, but the only assessment instruments we have do not reveal this. In a class of 26 ten-year-olds in Victoria, Australia, with rich access to computers, five children performed at a very low level when working with verbal expression only, but responded remarkably when invited to work multimodally. A programme of text production was monitored and the results analysed, progressing from handwritten monomodal work, through stages of multimodality to full multimodal expression. The results suggest strongly that some children need multimodal scaffolding in order to communicate complex ideas effectively. This, however, requires an acceptance of multimodal texts as part of the primary literacy curriculum. It is therefore suggested that assessment of multimodal composition, both narrative and other texts, should be developed to help teachers accept the value of introducing multimodal literacies into the classroom.