The comparison of the media agenda with the public agenda has been operationalized in four different categories. The researchers of the agenda-setting theory call these kinds of designs as the Acapulco typology (McCombs, 1981).
This typology was first presented at the International Communication Association convention in Acapulco , Mexico . So this is the reason why this typology is called as Acapulco typology.
• The first type of this typology compares the news coverage for a set of major issues to the aggregate public agenda. The original Chapel Hill study is the best example of Type I design in the agenda-setting literature.
• The second type also examines the media agenda (defined in terms of a set of issues), but shifts the units of analysis for the public agenda from the aggregate population to the individual. In such situations, the rank-order of an agenda of issues is determined for each person on individual basis.
• The third type determines the relationship between the media coverage of a single issue and the public opinion about this issue over a period of time. The study of Winter and Eyal (1981) is an example of this type of Design.
• Type four investigates the relationship between the media coverage of a single issue and the salience of that issue on an individual agenda. The research design of the laboratory experiment is also used in this type and it complements the field research. For example, Iyengar and Kinder (1987) conducted their research on agenda-setting effects repeatedly in a series of laboratory experiments. During the laboratory experiments, the participants watched actual television programs to enhance the salience of certain issues. The result was according to the expectations of the researchers and an increased level of concern was found for the desired issues.
There are 5 types of agenda setting, which you explain it is called source base agenda setting and the other four
Media based Agenda
Public base agenda
policy based agenda
corporate based agenda
i hope you will know these.
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