By 2005, Alison Bechdel was under no illusions about the power of that movie test. It had started to take on a life of its own, reproduced under a variety of names.
One of the most pervasive was the Mo Movie Measure. Mo was one of the earliest and most popular protagonists in DTWOF. With readers reaching back into shady memories, it seemed to them that it was Mo who came up with The Rule.
It wasn't. The character who said it was actually unnamed. Mo hadn't even entered the series yet. Nevertheless, the misattribution stood and the Mo Movie Measure is the name by which many commentators refer to it.
Alison Bechdel had a confession to make. She hadn't conceived of The Rule. She'd just included it in her comic strip.
Her friend, and karate training partner, Liz Wallace had been the one to come up with the criteria. Bechdel gave a nod to her by adding a sign above the marquee in the background. The Wallace Marquee, it read, a private joke between friends. Neither of them knew it would become so big!
Some writers immediately altered their references, so that The Rule (as it had been known in the comic strip) was renamed the Bechdel/Wallace Rule. Some changed it entirely to The Wallace Rule.
Meanwhile, there was one more element to be added in. Ampersand, writing in Alas! A Blog, publicized the test, but misremembered the first part. She thought that the two woman had to be named, though the original had merely said that there were two female characters.
In apologizing for the Chinese Whispers type error, she also let slip that she was the person who'd mistakenly attributed The Rule to Mo in the first place!
It didn't matter in the long run. The most popular version of The Rule now reads as Ampersand reported it, with The Bechdel Test becoming its most commonly used moniker.