How to make practical assessment rubrics for vocational training fairer?

For practical assessments in vocational training, if you just write "Project Completed," it's hard to be fair in the end. Students will feel the instructor is grading based on intuition, and the instructor won't be able to explain why one person got an 85 and another got a 70. I later broke the rubric down into several observable actions: whether preparations are complete, whether the sequence…