I am reaching out to see gauge your interest in participating, as well as ask if you know of others who should be identified. (cacommunityschools.org)
This is certainly an effective strategy to gauge the interest of content within the pages of a good book even before writing the manuscript. (howtoblogabook.com)
I used it to test the waters and gauge interest for test prep among the subscribers I already had on my blog. (hacktheentrepreneur.com)