In essence, a debate between two different positions. When presenting an argument, a dialogic argument acknowledges there is another point of view to contend with and attempts to deal with this through solid reasoning backed up with evidence. Combative argumentation refuses to acknowledge or accept the validity of another point of view; rather than actively wrestle with a contradicting point of view, it dismisses it, or more vulgarly, shouts it down.
Modes of transferring/conveying something. A medium (plural media) is the vehicle that transfers the thing; a plane is the medium that transfered me from Richmond to Chicago in May. For our purposes, we're dealing mainly with mass media, or methods of conveying news and other information. BBC News, for instance, incorporates reporters on the ground who write, radio reports, on line content, and television reports --each is a medium. Although media is largely used as a stand-in for news, a song can be a medium, a sign, and advertisement, a film, or your own voice.
(from The Phaedrus)
From Greek, literally meaning a "carrying over a change" in meaning. What's being carried over? A metaphor makes a connection between two unlike things, and the sense of one thing is carried over to the other. "Coffee is my life's blood." No it's not. If you cut open your arm and look for mocha java roast, you're not going to find it. The sense that is carried over is that coffee helps make you feel alive and vital –it's just not as interesting to say it like this, and it isn't as powerful because the audience doesn't get to go through the experience of realizing the understanding themselves. In metaphor, the audience makes the connection, and by the very fact that the audience is more actively involved in that interpretation means that the audience experiences more of the dynamic, and thus will supposedly understand the meaning on a more complete level.
When there is a gap between the way something is presented and the reality of that situation, that gap is what is called irony . On the level of media, irony is a good thing to keep in the back of your head (call it a healthy skepticism) when judging the content and quality of information you're getting. Is the writer/presenter presenting the information in a way that neglects important aspects of an issue, or does the presentation raise questions that are not addressed? If so, is the writer/presenter doing this unintentionally or intentionally? Which brings us to:
Just a note: We're always living with a certain level of irony; even at the level of language, there's always a gap between the presentation of something and its reality. The cup of stuff I drink each day in class can be coffee, or kafe, or кофе, or kávécserje, or

Which is the right representation of the stuff people drink in class? All and none --they're only related to the stuff people drink because of anassumed social agreement that "coffee" represents that stuff, and not

There's a gap here between the presentation of the thing "coffee" and the reality of the stuff I drink.
So, we're always already dealing with some level of irony even as we speak and write. Recognizing this can only help us pay a little closer attention to how we use language and form arguments.
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The means for conveying information takes precedence over the actual information presented
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Marshall McLuhan's claim that the real message of media is not the content conveyed, but the very fact that technology is conveying information. Whenever some new medium is designed to convey information, McLuhan argues, it sparks a new form of social organization, and that's the important thing to note. Take for instance the printing press; this allowed manuscripts to be mass produced and spread among a wider audience, and makes the mass production of knowledge possible. Or take the television, which made it possible for people in separate geographical locations to receive the same information at the same moment in time, and at a much more rapid rate than could be achieved by a printing press. Today we have the Internet and the various media that constitute it; you may use a messenger program where you can talk with various friends from around the world at the same time, some you may have never met; you may lurk on blogs, discussing various issues with people you may never meet --the Internet is yet another form of media that has instantiated new forms of social organization that we deal with every day. (If this makes you think of the term "global village," it might be because McLuhan coined that term in his research of mass media.)
An example of this: Say you're getting information about the recent clash between UK troops and Iraqi police in Basra, Iraq. You have these options:
- Daily newspapers
- Dedicated pages on the Internet
- Blogs
- Newspapers on the Internet
- Mobile Phone
- Magazines, which come out monthly or weekly, but tend to have more in-depth information and are glossier
- A monthly journal, which tends to be not flashy at all, but is written by policy analysts and scholars
- Television
- Public radio (BBC, NPR, CBC, etc.)
- Commercial news radio (Fox News Radio, Rush Limbaugh, Bill O'Reilly, Air America )
Which forum do you choose and why? One way to think about this is that the reason you choose one medium over another suggests something about the chosen medium communicates to you in a way the others do not, and that's the message. In other words, the potentialities that a medium contains is a medium's message (a printing press contains the potential to mass produce any number of texts, from chemistry books to ad labels, etc.; a lightbulb contains the potential to allow you to read at night, see the street when you're driving in the dark, burn your fingers changing it, etc.; a radio contains the potential to drive you batty with treacly top 40 pop and annoying hyperactive DJ's, bring you news about the world, play cool jazz, or make you rage in your car while stuck in traffic listening to AM talk radio, etc.)
Another Marshall McLuhan idea; a hot medium provides a lot of information for you to be able to easily apprehend the content (i.e. it's content-rich); a cold medium requires the audience bring a prior understanding to the medium in order to understand the content (i.e. it's content-poor). This is a bit different for us today than it was for McLuhan back in the 1960's; he didn't have laptops and cell phones and instant messenger and the Internet. Can something that is content-rich for one person be content-poor for another? Does the same hold for news information?
Placing two distinct concepts next to each other in an argument to hint or suggest that the things are really connected, when in fact they're not. This is a sneaky sort of argumentation. Think ads that suggest if you use this deodorant you'll be sexy or successful not by telling you so, but by showing sexy and successful people happily putting on deodorant. On a larger political level, think of a politician who might claim something like "cutting education funding is anti-American" and later that "my opponent wants to cut education funding," but refuses to say the opponent is anti-American; it doesn't need to be said, the audience will make the connection. (By the way, this is how a warrant operates --it's an assumption you hope your audience shares.) The largest and continuing example of this today would be that Iraq was involved in the 9.11 attacks; the 9.11 Commission, which was bi-partisan, made up of all parties in government, researched all the intelligence and evidence that they had, much the public will never see, and officially concluded that Iraq was not involved in the 9.11 attacks, yet this claim is still made on a regular basis through enthymatic argumentation. (i.e. While we're fighting terrorism in Iraq , we need to remember the attacks of September 11…)