I like to think of a funnel as the way we bring candidates into the organization and through the recruiting process. The resumes are the huge intake. The resume review starts to narrow the funnel, the phone screen narrows it more. As you use elimination questions in the phone screen, you knock people out before you get to the interview. During the interview, you eliminate more people, and finally, hopefully, you have candidates you want to make an offer to.
This is why you don't want your resume filter to be too tight. You have narrowed the candidate funnel too early. And, this is why you don't want the phone screen funnel to be too loose. You let too many candidates into the interview funnel, which wastes too much interview time. Yes, I explain all about how to do this in Hiring Geeks That Fit. My editor suggested an image that would explain this instead of sooo many words.
I've attached what the current image looks like. Does this look like a funnel to you? Should I turn it sideways? Oh, I am still challenged by creating images. I would love your feedback.