Legacy systems are those software / computer systems that you already have in place and have been using. COTS stands for Commercial Off-The-Shelf software and is software or services that can be purchased and used under a government contract. If you’ve already got existing legacy systems that do what you need except that they don’t talk to each other. You need to get data out of one application into another one. Or maybe you’ve bought or found some Commercial Off-The-Shelf software that does most of what you want but not quite everything so you need a customized solution. Or maybe it’s a mix of both of these.
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