Public deliberation depends on how skillful communicators are in establishing their version of what is known to be publicly acceptable. This volume provides rhetorical analyses of institutional websites, political speeches, scientific presentations, journalistic accounts or visual entertainment. It shows the significance of rhetorical construction of knowledge in the public sphere. It addresses the issues of citizenship and social participation, media agendas, surveillance and verbal or visual manipulation. It offers rhetorical critiques of current trends in specialist communication and of devices used when contested interests or ideologies are presented.