The strip popularized what is now known as the Bechdel test, also known as the Bechdel/Wallace test, the Bechdel rule, or Bechdel’s law. Bechdel credits her friend Liz Wallace for the test, which appears in a 1985 strip entitled “The Rule”, in which a character says that she only watches a movie if it satisfies the following requirements:
1. It has to have at least two women in it,
2. Who talk to each other,
3. About something besides a man.
A variant of the test, in which the two women must additionally be named characters, is also called the Mo Movie Measure. The name is a misnomer as neither Mo nor the other regular characters had been introduced yet at the time of this strip’s publication.