Finally, big economic and social changes, such as the decline of safe jobs and big factories, have reinforced this generational shift in ways that the executives of large, stable media corporations simply do not understand. These changes were stressed by Richard Sennett, professor of sociology at the London School of Economics, in a keynote speech to a private seminar on Monday at Broadcasting House, when 50 BBC executives - along with 50 politicians, academics, business leaders and communications experts - were given their first glimpse into Kevill's research.