I need to build a database to “grade” the work of my team. My question is this: I grade on a certain set of requirements (for example, did this person meet all the requirements of steps 1-10?), but in the coming months, I'll need to update my requirements (did this person meet all the requirements in steps 1-7 & 11-13?). Successfully meeting the requirement builds a score for that assignment. Is there an easy way to disable or hide the “outdated” fields and add new fields but not affect the score of the assignments that were completed before the change in requirements?