These articles about the rating system shown in alphabetical order were moved from www.whsca.org in 2010 and gradually added to over time. Some of these are out of date but provide some good history.
Addition of Adults to the NWSRS
An Explanation of the NWSRS
An overview of how the system works, and how school codes are assigned
Ratings Database and the NWSRS
An introduction to the rating algorithm and the fields in the database
Northwest Scholastic Rating System (NWSRS)