Finally, species richness may not be the most relevant indicator of «biodiversity» when studying biodiversity - stability relationships. (sciencedaily.com)
The other relevant indicator is student grades, although this is considerably more subjective. (sia-us.com)
A much more relevant indicator of HR's performance would be, say, the extent to which principals are able to hire people whose skills are aligned with their school improvement plans, which you can measure through surveys or interviews. (kappanonline.org)