This article was intended for a different forum. When that didn’t work out, I decided to park it here. – Professor of Sociology William H. Sewell was deeply interested in social mobility. Do career aspirations affect career achievement? Do individual and social traits underlie those aspirations? Despite some preliminary research in the 1950s, Sewell lacked the data to answer these questions. In 1962, Sewell made a lucky discovery: sitting unused in a University of Wisconsin administration...