This has been updated for the 2014-15 school year. The Webcasts below are have not yet been updated for this school year. I would like to bring the "Lab Parasite" problem to the attention of all students and parents (explained in the link above). In this scenario I do reserve the right calculate term or semester grades using the median. (Last updated August 2016)
This is a link to a professor, Steven Dutch, at the University of Wisconsin. I felt compelled to give him credit for his comments, they are not my own. Some of his comments are not applicable to high school but with nearly 20 years of experience I share similar beliefs. I felt that I should share them with you.
Grading & Assessment Webcast Part 1
Updated 2017: Some minor changes have been implemented for instance in situations where grades are equal or distributed equally I have used exam scores to make the final decision. Should the student not agree with that decision then retakes are offered so that the student has control over there final grade(s).