", in [3]. II . The consistency of models may be conceptual or physical. In many areas of research conceptual models have become the dominating species, as conceptual models, more easily than physical ones, can be investigated by means of computing. For conceptual models to be the shared property of a research community the concepts they involve must be capable of being shared. That is the case when a consensual understanding of these concepts has been achieved or can be achieved by means of definition, examples, etc. With respect to what is shown by a conceptual model there are differences at least with respect to computer science, mathematics and logic. Hot Model Pure Mathematical models in one way or another establish a functional cohesion between entities such as input values and output values. Logical models establish an interpretation relationship between formulae and structures. "

"] In order for an advertising message to be perceived, the brain of the television viewer must be available. Our broadcasts are aimed at making that brain available: i. e. by distracting it, by relaxing it and preparing it between two messages. What we sell to Coca-Cola is time with this available human brain. " Sourcing The third filter concerns the mass medias' need for a continuous flow of information to fill their demand for daily news. In an industrialized economy where consumers demand information on numerous global events unfolding simultaneously, they argue that this task can only be filled by major business and government sectors that have the necessary material resources. Hot Import Model This includes mainly The Pentagon and other governmental bodies. Chomsky and Herman then argue that a "symbiotic relationship" arises between the media and parts of government which is sustained by economic necessity and reciprocity of interest. "