One space or two? One! Every time!

This has been a bone of contention between me and my better half for a while now. She was trained as a touch-typist back in the Twentieth century. I wasn’t.

One space between each sentence, they said. Science just proved them wrong.
The rules of spacing have been wildly inconsistent going back to the invention of the printing press. The original printing of the U.S. Declaration of Independence used extra long spaces between sentences. John Baskerville’s 1763 Bible used a single space. WhoevenknowswhateffectPietroBembowasgoingforhere.Single spaces. Double spaces. Em spaces. Trends went back and forth between continents and eras for hundreds of years, Felici wrote.It’s not a good look.

And that’s just English. Somewrittenlanguageshavenospacesatall and o thers re quire a space be tween ev e ry syl la ble.

Ob viously, thereneed to be standards. Unless you’re doing avant – garde po e try, or something , you can’tjustspacew ords ho w e v e r y o u want. That would be insanity. Or at least,


I really hadn’t appreciated how much of an issue this was. Some US psychology researchers sought to determine the correct approach once and for all.

First, they put the students in front of computers and dictated a short paragraph, to see how many spaces they naturally used. Turns out, 21 of the 60 were “two-spacers,” and the rest typed with close-spaced sentences that would have horrified the Founding Fathers.

The researchers then clamped each student’s head into place, and used an Eyelink 1000 to record where they looked as they silently read 20 paragraphs. The paragraphs were written in various styles: one-spaced, two-spaced, and strange combinations like two spaces after commas, but only one after periods. And vice versa, too.

And the verdict was: two spaces after the period is better. It makes reading slightly easier.

So it seems scientific research is against me. I’m still not changing my mind, though, as the study’s methodology is not without its critics.

No, you still shouldn’t put two spaces after a period
The study used Courier New… This alone makes the test useless. One-spacers already agree that typewriters and monospace fonts use two spaces after the period (except some screenwriters, who use one space). But reading a proportional font and a monospace font are two completely different scenarios. The study even acknowledges this: “It is possible that the effects of punctuation spacing seen in the current experiment may differ when presented in other font conditions.” Of course it’s possible—that’s what the whole debate is about! Why would you use Courier New!

Author: Terry Madeley

I work with student data and enjoy reading about art and design, data, education and technology.