Acknowledgments

I would like to acknowledge the following people for their helpful comments on earlier drafts of this paper: David DeVries, Phil Doster, Diane Ducat, Rebecca Henson, Bob Hurley, John Lopiano, Stan Sheetz, and Amy Webb. In addition, Bill Drath helped me early on to clarify the basic character of the paper. And Connie McArthur was instrumental, as I prepared to write the final draft, in sharpening my focus.