Step change
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In common usage a step change happens when a situation changes in a discontinuous way: a big policy change after an election, a currency devaluation, the discovery of gold at Sutters mill for example. That is to say, a change like a step in an otherwise smooth graph.

This concept has been borrowed from mathematics and technology where the phrase step function is rigoursly defined.

Retrieved from "http://en.wikipedia.org/wiki/Step_change"


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Note added at 2 hrs 42 mins (2006-01-03 02:18:03 GMT)
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Noun
step change

a sudden change in the value of some variable, especially a discontinuous one
Usage note: Originally used in the power supply industry, this now seems to be used instead of quantum leap by people who know that term's real meaning
Retrieved from "http://en.wiktionary.org/wiki/step_change"


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Note added at 2 hrs 52 mins (2006-01-03 02:28:01 GMT)
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Definiciones de step change en la web en inglés:

A sudden change that is sustained, occurring in either the influence or control quantities.
www.elpac.com/resources/glossary.html

A sudden change in a power converter parameter. Typically used when referring to changes in output load or input line during power system testing.
www.beta-dyne.com/resources/glossary.html