When are words just words, and when do words force action? Linguist J.L. Austin divided words into two categories: constatives (words that describe a situation) and performatives (words that incite action). For instance, is a "No running" sign describing your gait, or are you not running because the sign prohibits it? Colleen Glenney Boggs describes how these categorizations give power to words and, ultimately, to your actions. [3:57]