"While standards-based grading is one attempt to reduce how subjective letter grades are–measure and report proficiency based on standards as ‘grades’–this is only a step in the right direction. Here, at least parents know what a grade is based on, but they still don’t know any more about what their son or daughter understands.
The ideal ‘response’ here isn’t a single change, but a total merging of schools and communities. But until that happens, there are options."
~12 Alternatives to Letter Grades by Terry Heick