Hi Stephen:
You are correct that good evaluation systems should be consistent and fair. These tenets are easily constructed when rote memory or quantity of submitted items is the only requirement.
Being consistent becomes more challenging when manual dexterity or manipulative skill is being evaluated. Fairness could be challenged when thought, opinion or argument is being evaluated, such as in a written paper.
Clarity of what is to be evaluated accompanies fainess and consistency very nicely.
Regards, Barry