Joan Bissell has shared this document with me, and I am passing it on to you. Here is the link to the .pdf file. 

http://app.aaas-science.org/e/es?s=1906&e=104945&elq=764bab...

If you were not aware, the NAP has many resources that are free to download. This text is by Linda Kober; Board on Science Education; Division on Behavioral and Social Sciences and Education; National Research Council

For a list of additional resources link here: http://www.nap.edu/catalog/