Stephanie, we use grading periods extensively. We set them up at the beginning of the year, however there is no reason why you couldn't set them up now. The couple things to watch out for: the start and end dates of a grading period will dictate which grading period an assignment grade is calculated and counted. If you have that pretty well marked off, there wouldn't be an issue. Also, Brandon Lewis mentioned being 'locked out'. This used to be a major issue that teachers could not change grades after a grading period ended, however if you set the "close date" to sometime much later, then its not an issue. For example, I might start Quarter 1 Sept 1 and end it on October 15. However the close date, might not be set to July 1 which lets teachers edit grades as needed before, during, or after the grading period, but before that close date. These are also very flexible in that we run quarter courses and semester courses at the same time, but in different, concurrent grading periods. It works very well.
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