A rubric is a scoring tool that divides an assignment into components and provides detailed descriptions of acceptable performance levels for each component. Rubrics improve consistency in grading, make expectations clear to students, and provide feedback to help students improve. Key parts of an effective rubric include a task description, performance levels with associated points or scores, dimensions/criteria being assessed, and descriptions of what constitutes each performance level. Rubrics should be shared with students before assignments to clarify expectations and allow self-assessment.