According to Chomsky, "most of the book" was Herman's work.[7] Herman describes a rough division of labor in preparing the book whereby he was responsible for the preface and chapters 1-4 while Chomsky was responsible for chapters 5-7.[8] According to Herman, the propaganda model described in the book was originally his idea, tracing it back to his 1981 book Corporate Control, Corporate Power.[9] The main elements of the propaganda model (though not so called at the time) were discussed briefly in volume 1 chapter 2 of Herman and Chomksy's 1979 book The Political Economy of Human Rights, where they argued, "Especially where the issues involve substantial U.S. economic and political interests and relationships with friendly or hostile states, the mass media usually function much in the manner of state propaganda agencies."[10]