The article discusses the challenges of implementing a focus on 21st century skills in education. It argues that critical thinking and problem solving are not truly new skills, but that schools need to do a better job of teaching these skills intentionally to all students. To be successful, the 21st century skills movement will require improved curriculum, better teacher training, and new assessments that can measure more complex skills. Implementing changes to all three areas will be an immense challenge that past reforms have not adequately addressed.