Using media content data produced by Issues Management of Alexandria, Virginia (also known as "The Conference on Issues and Media"), a study examined agenda-setting for network television news, newspapers with broad syndication, and national weekly news magazines. Issues Management bi-weekly publishes the combined content for all three national media, with over 300 issues coded. The study focused on three questions: (1) Is agenda-setting strong or weak? (do people respond to media content?); (2) How does the choice of issues affect results? and (3) How quickly do people respond? (is a build-up of coverage needed to create response, as in an advertising campaign?). Eleven issues were selected, including cost of living/inflation, international tensions, morality, and crime. Issues were classified as to direct experience (high, moderate, or low). The study extended the "most important problem" paradigm, using George Gallup's response to this question as the measure of importance. Findings indicated that the amount of media content was positively correlated with issues the public said are most important to the nation, and that the correlation between media coverage and issue importance varied by issue. Findings also indicated that correlation was greater when media coverage led measurement of importance rather than the reverse. (Nine tables of data are included, and appendixes consist of a reconciliation of codes between Gallup and Issue Management and the definition of coincidental Gallup and Issues Management Measurement Period. Forty references are appended.) (MM)