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I haven’t seen it mentioned yet, so… The infographics I see implicitly have editorial comment; that is, they argue a point. The example cited by the original poster is not a random collection of facts graphically displayed, but a selection of facts intended to support a proposition: to wit, that the growth of human population is straining the planet’s resources and ecosystem. I would not say argument is the sole purpose of an infographic, but it is at least the common purpose.
So: are infographics technical communication? I would say so, yes! But do we commonly use them? I would argue no 8^)
— Steve (arguing on his spare time)
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