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in the current media landscape, the enormous social influence of communication was already apparent decades before Mark Zuckerberg invented Facebook. In The Making of the President, 1972, American journalist Theodore White described the power of the news media to set the agenda of public attention as ‘an authority that in other nations is reserved for tyrants, priests, parties, and mandarins’.3 In the years since White’s cogent observation, social scientists across the world have elaborated the ability of the news media and an expanding panoply of communication channels to influence many aspects of our political, social, and cultural agendas.

      One of the most prominent and best-documented intellectual maps of this influence is the theory of the agenda-setting role of the communication media, which is the subject of this book. Theories seldom emerge full-blown. They typically begin with a succinct insight and are subsequently elaborated and explicated over many years by various explorers and surveyors of their intellectual terrain. This has been the case for agenda-setting theory. From a parsimonious hypothesis about the effects of the news media on the public’s attention to social and political issues during election campaigns, agenda setting has expanded to include propositions about the psychological process for these effects, the influences that shape communication agendas, the impact of specific elements in their messages, and a variety of consequences of this agenda-setting process. Expanding beyond the traditional news media, agenda-setting theory has become a detailed map of the effects of the flow of information about public affairs through a growing plethora of communication channels.

      The formal explication of the idea of agenda setting began with my move that autumn to the University of North Carolina at Chapel Hill, where I met Donald Shaw and began what is now a fifty-year plus friendship and professional partnership. Our initial attempt at formal research on this idea built literally on those speculations in Los Angeles about the play of news stories. We attempted to construct an experiment based on actual newspapers that played the same story in radically different ways. The Charlotte Observer was a widely respected newspaper in North Carolina, which produced a series of editions during the day, early ones for points distant from Charlotte, the final edition for the city itself. One result of these multiple editions was that some stories would begin the day prominently played on the front page and then move down in prominence in subsequent editions, sometimes moving entirely off the front page. Our original plan was to use these differences from edition to edition as the basis of an experiment. However, the shifts in news play from day to day proved too erratic – in terms both of the subjects of the stories and in the way that their play in the newspaper changed – for any systematic comparison of their impact upon the public’s perceptions.

      Despite this setback, the theoretical idea was intriguing, and we decided to try another methodological tack, a small survey of undecided voters during the 1968 US presidential election in tandem with a systematic content analysis of how the news media used by these voters played the major issues of the election. Undecided voters were selected for study on the assumption that, among the public at large, this group, who were interested in the election but undecided about their vote, would be the most open to media influence. This was the Chapel Hill study, now known as the origin of agenda-setting theory.4

      A fundamental contribution of the Chapel Hill study was the term itself, ‘agenda setting’, which gave this concept of media influence immediate currency among scholars. The late Steve Chaffee recalled that, when I saw him at the 1968 annual meeting of the Association for Education in Journalism and told him about our study of agenda setting, the term was new and unfamiliar but he immediately understood the focus of our research.

      To paraphrase Sherlock Holmes, with the success of the 1968 Chapel Hill investigation, the game clearly was afoot. There were promising leads in hand for the solution to at least a portion of the mystery about the precise effects of the media upon public opinion. Subsequently, many detectives began to pursue these clues about how public attention and perception are influenced by the media and how various characteristics of the media, their content, and their audiences mediate these effects. Much like the adventures of Sherlock Holmes, whose cases fill nine lengthy volumes, a wide variety of links in this vast intellectual web has been chronicled. However, because the marketplace of ideas in communication research is very much one of laissez-faire, elaboration of the agenda-setting role of the communication media has not always proceeded in an orderly or systematic fashion. There have been many detectives working on many cases in a variety of geographical and cultural settings, adding a bit of evidence here and another bit there over the years. New theoretical concepts explicating the idea of agenda setting emerged in one part of this intellectual web, then in another.

      Moving beyond an agenda of issues, agenda-setting theory has encompassed public opinion about political candidates and other public figures, specifically the images that the public holds of these individuals and the contributions of the media to those public images. This larger agenda of topics – public figures as well as public issues – marks an important theoretical expansion from the beginning of the communication process, what topics the media and public are paying attention to and regard as important, to subsequent stages, how the media and public perceive and understand the details of these topics. In turn, these stages are the opening gambit for mapping the consequences of the media’s agenda-setting role for attitudes, opinions, and

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