We would like to benchmark our CPI (Cost per Interview/Survey). We handle around 3M survey responses a year as part of our VoC program at Amex, and like everyone, we want to make sure we are doing so on a cost-effective basis.
If any of you would care to share here in the community or privately (august.f.ray@aexp.com) what your CPI is for your surveying programs, I'd be happy to share ours, as well (although I've been asked not to post it.)
Thanks,
Augie