Not sure these Nasa guidelines are current. >> Sans-serif fonts are usually more legible than fonts with serifs. >>Avoid using dot matrix print for critical f

Not sure these Nasa guidelines are current. >> Sans-serif fonts are usually more legible than fonts with serifs. >>Avoid using dot matrix print for critical flight-deck documentation. The serifs on fonts make it easier to distinguish letters and ligatures. It is the reason nearly every textbook and journal article is written in serif fonts. Because serif fonts dominate in print, you eventually train mostly on this font and therefore you can read text in a serif font faster than sans-serif. On a dot-matrix printer (see Nasa guidelines) and low resolution monitors, sans-serif is a better choice. But that era has ended. Serif fonts are dead, long live serif fonts.