The tipping point is the critical point in an evolving situation that leads to a new and irreversible development. The term is said to have originated in the field of epidemiology when an infectious disease reaches a point beyond any local ability to control it from spreading more widely. A tipping point is often considered to be a turning point.
The term is now used in many fields. Journalists apply it to social phenomena, demographic data, and almost any change that is likely to lead to additional consequences. Marketers see it as a threshold that, once reached, will result in additional sales. In some usage, a tipping point is simply an addition or increment that in itself might not seem extraordinary but that unexpectedly is just the amount of additional change that will lead to a big effect. In the butterfly effect of chaos theory , for example, the small flap of the butterfly's wings that in time leads to unexpected and unpredictable results could be considered a tipping point. However, more often, the effects of reaching a tipping point are more immediately evident. A tipping point may simply occur because a critical mass has been reached.