10. Write routinely over extended time frames (time for research, reflection, and revision) and shorter time frames (a single sitting or a day or two) for a range of tasks, purposes, and audiences.
Ultimately, writing is a skill for adult life, growing steadily more important in an information age. This last Common Core writing standard calls for writing to become a reliable, flexible habit for all students by the time they complete high school, so that they are ready for college and career success.
That writing won't all be sonnets and it won't all be work memos: the writing the next generation will do will have varied goals and styles and deadlines, but Common Core aims for them to be ready to participate, contribute, and write in the ways that are valuable for their future and ours.
You can download the complete Common Core State Standards here. They were developed by organizations of governors and chief state school officers like Kentucky's Commissioner of Education, and they've been adopted by 46 states (47 for the mathematics standards).