Posted by sam on Thursday, August 12, 2010 at 7:28am.
You mean "an information system"? (singular?)
http://www.answers.com/topic/information-system
Read ALL the definitions; keep scrolling down to see how this term is applied in different settings.
http://www.google.com/search?q=how+information+systems+work&ie=utf-8&oe=utf-8&aq=t&client=firefox-a&rlz=1R1GGLL_en___US379
There are several articles in here that will help you understand how information systems work -- depending on the setting.
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