Front Trigger

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Front triggers are the people, places, things, ideas, and scenarios that may cause a system member to front or be drawn near the front.

Front triggers can be both negative and positive.

Negative front triggers may be described as a member being alerted to a situation.

History
A front-triggered switch has been described as early as 1972, referring to an "automatic switch-over mechanism", with a member being drawn to front referred to as "evocation of [that member]".