Mastery Based Grading
Since fall 2020 I have been using a masterybased grading system instead of a traditional pointsbased approach. Here is how it works in one particular course, Math 104: Introduction to Probability:
The Mastery Based Scale
There are no points anywhere in the grading scheme. Instead, each assessable item is scored on the following mastery scale:
Mastered  Progressing  Needs Improvement  Ungradable 
Your solution is complete and correct, or contains only a minor, nonconceptual error.  Your solution shows significant understanding, but contains enough errors or omissions that it isn’t up to the level of mastery.  You have made a reasonable start on your solution, but it is seriously inaccurate, unclear, or incomplete.

The solution hasn’t been started or cannot be read, or there isn’t enough written to assess accurately. 
There is a detailed list of 36 learning goals for the course, and they are used directly in the assessment of student work on homework and exams.
Each homework assignment has one or more learning goals associated with it. Each exam has a large number of learning goals associated with it, and the final has all of them. Students receive extensive comments on their work, and a score on the mastery scale for each associated learning goal.
Assignments and exams are scored separately, so that for each learning goal, a student has separate scores in the assignment category and in the exam category. There is also, for each learning goal, an overall, courselevel mastery score, which is the greater of the assignment and exam scores for that learning goal.
Opportunities to Improve Scores
For each homework assignment and exam other than the final, students can submit the solution to a “second chance” problem. A strong enough performance will improve the mastery score on one learning goal for each assignment or exam.
From Mastery Scores to Course Grade
To earn a particular letter grade for the course, a student must achieve at least the indicated mastery levels in all columns:
preclass work (21)  inclass work
(21) 
Quizzes
(21)

postclass assignments
(36 LGs) 
Exams
(36 LGs) 
Learning Goals
(36) 

A  19  10M, 7P  9M, 8P  29M, 5P  29M, 5P  32M, 4P 
B+  19  9M, 8P  7M, 10P  25M, 8P  25M, 8P  28M, 6P 
B  18  8M, 9P  5M, 12P  21M, 11P  21M, 11P  24M, 8P 
C+  16  6M, 10P  3M, 12P  15M, 15P  15M, 15P  20M, 10P 
C  14  3M, 12P  15P  10M, 17P  10M, 17P  16M, 11P 
D  11  13P  12P  5M, 20P  5M, 20P  10M, 15P 
Examples:
To earn an A, the student must



 complete at least 19 (out of 21) preclass assignments, AND
 have scores on inclass work with at least 17 scores (out of 21) of P or better, of which at least 10 are M, AND
 have scores on quizzes with at least 17 scores of P or better, of which at least 9 are M, AND
 have scores on postclass assignments with at least 34 scores of P or better, of which at least 29 are M, AND
 have scores on exams with at least 34 scores of P or better, of which at least 29 are M, AND
 have scores on overall courselevel learning goals with at least 36 scores of P or better, of which at least 32 are M

