Recent research in disciplinary literacy has highlighted the need for writing instruction to move beyond the traditional English/Language Arts classroom and to be embedded in specific content areas. The goal is to help students learn to communicate as field experts, and thus better prepare them to use writing as a tool in future careers. However, because there is a dearth of published, validated measures, and due to the fact that the context and products of disciplinary writing can vary greatly, measures of writing skill or improvement tend to be study-specific. This has made cross-study comparisons difficult, and leaves practitioners unsure of how best to measure student growth. Bringing together validated measures and methods of assessing writing across the disciplines is needed to propel research and practice forward. Therefore, this volume serves as a resource for those teaching and researching by providing both methods and measures for assessing writing across the curriculum.