With the Apr 2017 release (detailed here: https://kb.blackbaud.com/articles/Article/109686 ), assessment skills can now be inactivated. They also have an amazing new filter interface that lets them be sorted based on where they are in use, among other features.

Several additional ways I think they could be improved further:

1. A filter for which year, school level, and/or course uses the assessment skill
2. The ability to 'select all' in a filtered result, so that a course/year's assessments could be bulk inactivated
3. If the grade plan column were an active link that took you directly to the grade plan detail that uses the related assessment skill.