One of the early considerations for architecting a system is to decide whether to provide services internally or to outsource them. You may have some of the following as your requirements:
- Plan ahead to accommodate new web services and other related technologies
- Improve service levels such as availability, scalability, security, efficiency, flexibility, and performance
- Reduce total cost of ownership
- Improve ease of deploying new services
http://www.opengroup.org/architecture/0404brus/papers/rakesh/abb-1.pdf
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