Once Marzano’s The Art and Science of Teaching became the adopted frame-work for our teacher evaluations, everyone was making learning goals and scales, and trying to figure out how to apply them to grading for students. The exact percentage alignments aren’t as important as understanding the meaning of each scale, and being able to communicate that meaning to parents and students. Everyone knows what an ‘A’ or a ‘B’ means; but very few will know what the scales mean. As a college student I was graded on a 4-point scale, but no one ever explained the difference between points; I just knew I should be between a 3.0 and a 4.0 to do well. The image below gives a suggested grading scale to align to Marzano scales.
The following excerpts are from a parent letter I developed to explain these differences to parents. This letter is available for free in an editable two-page MS Word document format so you can adjust it to your own classroom grading routines. Just follow the link and download.