To validate your interpretations and uses of students' assessment results, you must combine evidence from variety of sources that demonstrates these interpretations and uses are appropriate. Thus several criteria should be used to improve the validity of using your assessment results of grading students.
1- Content representatives:
Your assessment must emphasize what you taught in the class and contain content that is worth to be learned.
2- Thinking processes and skills represented: Your assessment must require students to integrate and use several thinking skills and processes and allow enough time for students to use complex skills.
3- Consistency with other classroom assessments: Your assessment must give pattern of results consistent with other assessments of the class, and contain individual items not too easy or too difficult.
4- Reliability and objectivity:
Your assessment must provide each students with several opportunities to demonstrate competence for each learning target assessed.
5- Fairness to different types of students:
Your assessment must be free of ethnic racial and gender bias and more over it must contain tasks that are interpreted appropriately by students with different backgrounds.
6- Economy and efficiency:
your assessment must represent appropriate use of students' class time and the teachers class time.
7- Multiple assessment usage:
Your assessment must be used in conjunction with other assessment results for important decisions. (What does the percentage does the assessment represent compared to the total grade).


