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Support for composite applications made up of Web services is something that
most companies have not thought through yet. Indeed support could be a nightmare considering the number of participants. If your accounting application, for example, is made up of many back-end Web services, you'll
have to go to each vendor or service provider for support. What's more, a
single back-end application that causes problems could take down the entire
system depending on the architecture.
The best model for this is perhaps Web sites today, or digital exchanges.
If your company is dependent on many remote Web sites for operational
activities, than you have to depend on the support organizations who support
those sites. The more sites, the more complex support gets. Same goes for
Web services, albeit they are more tightly coupled, and thus an many cases
could be a single point of failure.
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