Seems a bit of a storm in a teacup, though we know from bitter experience that it’s often the smallest issues that are most hotly debated. Thus the State Department’s decision to change its official typeface from Times New Roman to Calibri has been causing controversy. Mashable brings the story.

The justification is officially that Calibri is easier to read on a computer screen, and especially for the partially sighted, than is Times New Roman and that allegedly Calibri works better with OCR. There is a vanishingly small amount of research on readability, at all, and assertions that this or that typeface is more or less readable are usually based on little more than font-familiarity and personal prejudice. That sans is more readable than serifed type is “backed up” (by Mashable, not the State Department, I think) by a research paper which starts out “Texts are a collection of letters and words which are printed or displayed in a particular style and size.” This doesn’t exactly inspire confidence, but I suppose you do have to define your terms when you’re writing an academic paper.
Another bit of research they cite comes down wobblily on the side of sans as being more readable than serif type, although “Traditionally, serif fonts have been considered easier to read than sans serif fonts, but prior empirical evidence is scarce and inconclusive.” Sorry, but the research on which this paper is based also seems to me “scarce and inconclusive”. What the research actually shows is that 14pt Lucida Sans was adjudged by twenty students to be marginally more “readable” on a collection of 320 words than 14pt Lucida Bright (a serif font). “The present data demonstrate that serifs do not facilitate the process of visual-word identification; instead, the presence of serifs may (if anything) hinder lexical access.”
The case seems utterly unarguable to me: a serif type is less ambiguous than a sans serif font. One bit of text that’ll cause difficulty in Calibri and other sans serif fonts (like the one used in this blog, whose identity I’m not utterly sure about) is “Ill”. I bang up against the indistinguishability of Cap eye and lower case ell whenever I go on about Artificial Intelligence — looks like I’m talking about my chum big Al. This feature of many sans serif faces is an open invitation to OCR to get ahold of the wrong end of the stick. In your serif/sans serif research project you could of course “control” for this problem by excluding words which include this combination of characters. Maybe the State Department uses “sick” instead of “ill”, and has standing orders to spell out Artificial Intelligence whenever it’s referred to. Hope so. At least in Calibri the number 1 has serifs to distinguish 1 from I and l.

But of course, who really cares what typeface the Department of State uses? Even the reasons for the choice are hard to get too worked up about. I suppose it does make sense that everyone in the organization should use the same format, though I have always rather wondered why. The most significant finding in the paper may be the admission that “the default font in Microsoft Word is no longer a serif font (Times New Roman) but a sans serif font (Calibri).”
Conspiracy theorists will no doubt jump on this as showing an undue influence of the tech industry on our international diplomacy.