E-Prime attempts to remove the verb “to be” in all its forms from English: be, is, am, are, was, were, been and being, plus all the contractions. This has the tactical effect of eliminating the passive voice. According to proponents, it forces the writer (or speaker) to think differently, and often results in language that most people find easier to read.

E-Prime is an software applications suite for conducting psychological and neuroscientifical experiments, developed by Psychology Software Tools (PST) and first released in 1996. It offers control over almost every aspect of paradigm creation, and is temporally accurate to within a few milliseconds, a crucial aspect of control for many research needs. One of the benefits to E-Prime is its user base of over 10,000.