Hi Phillip: For me, I choose not to give extra credit at all. When a class begins, I believe it should contain all of the elements of the class including assignments, grading, grading scale - in short, it's all done in the beginning of the class. Adding something extra (unless it's given to all students and graded the same way) can be viewed as unfair, particularly by the better performing students who may feel slighted for slackers who get extra chances to bring their grade up. Extra credit is about points and grades, and less about learning required material. Regards, Barry