Our basic ratings process used for various sports and levels has remained unchanged for 25+ years. However, tackling something as large as national high school football has necessitated a few minor tweaks/fixes. Below is a historical recounting of the changes we've found necessary to make as we've learned what special problems doing ratings for the entire country brought since beginning in 2003.
Non-Connected Teams (three stages; prior to 2004/2005/2006 seasons)
Improved Projections (prior to 2006 season)
Early-Season Inaccuracies (prior to 2007 season)