An in-store nutritional rating program is going to school.

Guiding Stars, the retail rating system created by Scarborough, Maine-based Hannaford Bros. Co. in 2006, is introducing a rating system to the cafeterias of  the Windham Raymond School District in Maine, according to a Guiding Stars news release.

Foods served in the district will be given one of three ratings measuring their nutritional value: good (one star), better (two) and best (three).

The program already has been introduced at Windham High School. Other schools in the district are expected to follow in coming years.

The Guiding Stars system is used in Hannaford stores and has been licensed for use in other stores. About 1,500 stores along the East Coast use it.

Earlier this year, Guiding Stars revamped its Web site and broadened its outreach to customers via social media networks.