According to the website devoted to the NGSS, www.nextgenscience.org, "States have previously used the 'National Science Education Standards' from the NRC and 'Benchmarks for Science Literacy' from the American Association for the Advancement of Science (AAAS) to guide the development of their current state standards. While these documents have proven to be both high quality and durable, they are around 15 years old."
For the complete story: http://www.mycentraljersey.com/story/news/local/union-county/2015/02/12/preparing-new-science-standards/22987179/