This document discusses common problems with grading students and provides guidelines for determining grades. It outlines two common grading problems: grade inflation where teachers give higher grades to minimize failures, and questionable grading practices where the value of certain practices is unclear. It then provides three guidelines for deciding what evidence best represents a student's achievement: prioritizing the most recent, comprehensive, and important learning goals. The document also discusses that zeros are not accurate reflections of learning and are often used to punish students, and that behavioral issues should not factor into grades as they do not reflect performance.