Completed in April 2013, the Next Generation Science Standards are the result of a collaborative effort between the National Research Council, the National Science Teachers Association, and the American Association for the Advancement of Science, and Achieve. They began by developing the Framework for K-12 Science Education, which outlined the science concepts students in K-12 should know. Design teams were created in four areas: engineering, life science, earth/space science, and physical science. The draft they created was offered to the public for comment in 2010, and the revised, final version was released one year later.