In 1978, Gerbner, Gross, Jackson-Beeck, Jeffries-Fox, and Signorielli defined violence as " The overt expression of physical force (with or without weapon) against self or other, compelling action against one’s will on pain of being hurt or killed, or actually hurting or killing. Must be plausible and credible; no idle threats, verbal abuse, or comic gestures with no credible violent consequences. May be intentional or accidental; violent accidents, catastrophes, acts of nature are included.”