Rubrics are an advanced grading method used for criteria-based assessment. The rubric consists of a set of criteria plotted against levels of achievement. A numeric grade is assigned to each level. For each criterion, the assessor chooses the level they judge the work to have reached. The raw rubric score is calculated as a sum of all criteria grades. The final grade is calculated by comparing the actual score with the worst/best possible score that could be received.
There are two ways.
The first is at the point of setting up the Assignment.
The other is via the Assignment's Settings block: