Difference between revisions 17750371 and 17750451 on enwiki

In [[control theory]], '''Ffirst O-order Ccontrol''' is when a desired result is attempted by adjusting a scalar (first order) control.   Such mechanisms, where first order change successfully produces desired results, are called ''first order mechanisms''.  First  -order control is contrasted to [[Hhigher O-order Ccontrol]].

While many simple mechanisms are completely first order, most complex mechanisms are only first order within a range of operation.

An example of such a control mechanism is a [[trackball]] used to control a [[mouse cursor]]: a particular motion of the trackball causes a corresponding motion of the mouse cursor, until the cursor reaches the edge of the display. (The rigorous will note that a trackball is truly two scalar controls.)

==First order control failures==

===Range===

(contracted; show full), so it is often intentionally provoked. Certain to benefit from fallacious control that involves violence are hawkish and fascist political parties, armament manufacturers, and security forces. Other forms of fallacious control exist and should not be discounted, as when increased taxes inspire increased tax evasion: this can lead to the impoverishment of honest tax-payers and success for the dishonest.

==References==

*<i>Change</i> [[Paul Watzlawick]] [find urls]
[[Category:Control theory]]