There are two different things involved in evaluation
Setting a Standard of Evaluation: I believe that evaluations should be set in such a manner that, a student when exposed to it shall be able to know about what he gained vis-a-viz course objective(s). A course is designed to impart some skills, evaluations shall be able to help every individual student in finding his/her path to achieve that skill set.
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Awarding Marks: Lorem ipsum dolor sit amet, consectetur adipiscing elit. In tincidunt nisl felis. Praesent laoreet mollis justo id ornare. Curabitur congue, odio vel faucibus interdum, felis magna euismod ante, id dignissim lectus libero id nisl. . (if students don't work in collusion and show others report as their's ! )