Rubrics

Moodle 2.2

Rubrics are advanced grading forms used for criteria-based assessment. The rubric consists of a set of criteria. For each criterion, several descriptive levels are provided. A numerical grade is assigned to each of these levels. The rater chooses which level answers/describes the given criterion best.

Rubrics editor

TODO: how the editor works + screenshot

Using rubric

TODO: how the teacher uses the rubric during the assessment + screenshot

Grade calculation

The rubric normalized score (ie basically a percentage grade) is calculated as

$G_{s}={\frac {\sum _{i=1}^{N}(g_{i}-min_{i})}{\sum _{i=1}^{N}(max_{i}-min_{i})}}$

where $g_{i}\in \mathbb {N}$ is the number of points given to the i-th criterion, $min_{i}\in \mathbb {N}$ is the minimal possible number of points for of the i-th criterion, $max_{i}\in \mathbb {N}$ is the maximal possible number of points for the i-th criterion and $N\in \mathbb {N}$ is the number of criteria in the rubric.

Example of a single criterion can be: Overall quality of the paper with the levels 5 - An excellent paper, 3 - A mediocre paper, 0 - A weak paper (the number represent the number of points).

Example: let us have an assessment form with two criteria, which both have four levels 1, 2, 3, 4. The teacher chooses level with 2 points for the first criterion and 3 points for the second criterion. Then the normalized score is:

$G_{s}={\frac {(2-1)+(3-1)}{(4-1)+(4-1)}}={\frac {3}{6}}=50\%$

Note that this calculation may be different from how you intuitively use rubric. For example, when the teacher in the previous example chose both levels with 1 point, the plain sum would be 2 points. But that is actually the lowest possible score so it maps to the grade 0 in Moodle. To avoid confusion, it is recommended to always include a level with 0 points in the rubric definition.