
The rubric must be reliable. The best way to test this is to have another instructor grade a student with you rubric and compare their grade with yours.
Well, after reading this about Rubrics, it seems a fair and precise way to evaluate a students progress, as long as it is not too complicated.
Rubrics can be created using many sources such as google or your own instituition. the important thing to consider is to ensure the rubric is reliable, fair, and free of biases.
There are online websites that can help build your rubric. Also your rubric should be reliable, valid and fair so all instructors can have consistency in grading for the course.
I haved learned that just desiging a rubric because one was not there is not acceptable. The rubric must contain several components in order for it to be an effective teaching tool.
In todays age a simple "Google" can start you on your way to building your own rubric.