disturbance : a local variation from the average or normal conditions — Webster See also Dictionary of Cybernetics and Systems (Principia Cybernetica), OneLook, Free Dictionary, Wiktionary, Urban Dictionary
Disturbance is a temporary change in environmental conditions that causes a pronounced change in an ecosystem. Disturbances often act quickly and with great effect, sometimes resulting in the removal of large amounts of the system. Disturbance forces can have profound immediate effects on ecosystems and can, accordingly, greatly alter the surrounding community. Because of these and the impacts on populations, these effects can continue for an extended period of time. — Wikipedia
Brooke’s Law: Whenever a system becomes completely defined, some damn fool discovers something which either abolishes the system or expands it beyond recognition. — Wikipedia
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