EdWeek recently published an article, Guidance Needed on Strategies for Teaching Common Core, Study Says. Primarily, the Common Core Standards provide guidance without specifics -- teachers may determine on their own how to teach the subject matter. As a result, some teachers are struggling without additional professional development. From the article:
The authors argue that teachers need substantially more professional development around the common core, not just in understanding what the new standards include and how they differ from states' old standards, but also to fill the gaps in instructional strategies that will be needed for students to write well.