Grammar for Writing is a three-level series that provides students with the essential grammar applications they need to become proficient writers. Based on the series Eye on Editing , Grammar for Writing updates the existing two levels and adds a third level for expanded content coverage. The series features authentic writing excerpts and practical tools to facilitate comprehension and application for students enrolled in writing or combined-skills courses. ProofWriter , an online writing-assessment tool from ETS , provides students with immediate individualized feedback on grammar, usage, style, and mechanics.