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Usually, programmers would utilize COTS based functionality in order to create the perfect program. Commercial Of The Shelf programs are actually specific programs which are designed for a single function.
For instance, in terms of hospital and public records, a specific program is used. Such programs are known to have little or known extensions and can be used for a very long time. Such applications that are not covered by service oriented architecture are actually based on a different concept. According to several programmers, this traditional approach has an additional risk since programs used in this scenario are not like standard corporate applications that pass strict quality control and maintenance.
Unlike other programs, Commercial Of The Shelf or COTS programs do not have the same settings and processes that other software applications have.
In fact, such programs go through only some of COTS standard processes and principles. In terms of commercial of the shelf programs, developers might devote more or less time in standard stages that are normally applied in software development. The level of detail as well as documentation applied in COTS may change due to the process and sometimes may even involve other forms of testing and development.
For instance, a different code generator might be employed, one, which is quite different from standard coding, used in other programs. Some other approaches may also be used in COTS to be able to set the lifecycle utilized in development. Since standard methodologies arent applied, such acts might yield many perks and downsides. Such as that some bugs and troubles are not solved properly because a few of the processes are skipped.
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From: (COTS) http://www.jeanjoyce.com/cots/cots-precisely-how-soa-can-assist-useful-firm-via-ageing-organization-software/