The model that emerges from a review of the literature on writing places a strong emphasis on writing as an integrated, socially situated skill that cannot be assessed properly without taking into account the fact that most writing tasks involve management of a complex array of skills over the course of a writing project, including language and literacy skills, document-creation and document-management skills, and critical-thinking skills. As such, the model makes strong connections with emerging conceptions of reading and literacy, suggesting an assessment approach in which writing is viewed as calling upon a broader construct than is usually tested in assessments that focus on relatively simple, on-demand writing tasks.