A new grading scale that redefines what constitutes an “A” or an “F” is causing strife and confusion in the Cotati-Rohnert Park school district. Some teachers and officials say it lowers the bar for student success, while others say it encourages students to succeed. The new system is called the equal interval scale. Essentially, it makes it harder to get a failing grade. It departs from the traditional A to F scale in which students receive F’s for scores below 59 percent. Instead, the scale awards F’s only for scores below 20 percent.

“My mentor teacher, she’s not enjoying it. She’s got issues with it,” said Adam Green, a Rancho Cotate High School math teacher who likes the new system. “I respect her and I respectfully disagree.” Under the new policy, grades rise in 20-point increments. For example, scores of 20 to 40 percentage points earn D- through D+ grades — and so on, up the ladder. Students get an A- for scoring between 80 and 85, which traditionally is low B territory. FULL REPORT