As suggested by the software-functionality Venn
diagram above, different types of non-ES
business application software differ from ES
software on one or more of the defining
characteristics that ES.
For example, large-scale custom-built application
software might only differ in that it is not
packaged.
This matters, because packaged software is
likely to support more generic processes, and
hence will not fit a client organisation as well as
custom-built software.
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