I am wondering if most institutions have…

I am wondering if most institutions have teaching awards for TAs – who administers them, and how do they manage the logistics? At Western our grad student society awards these, but the undergrad association is also interested in a new award. In the case of faculty awards, they send someone to watch every nominee teach – and do a really thorough job observing, describing faculty teaching innovation. They are not sure how to manage the volume of nominations they may get for TAs. Any ideas and experiences? How does your institution choose the best TAs for awards? Based on comments? Observation?

Thanks,

Nanda