SOA lifecycle (need practical examples )?

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Hi,

I have studying SOA Life cycle. this is what I got
Model: Gather requirements
Assemble : Discover services to use
Deploy: integrate services that can be reuse
Manage : Manage services.

For theory I got this but in practical how this can be implemented. Can some one apply SOA life cycle on Examination System or Library System?

Note: this is not for some assignment. I got exam on coming monday and this topic is included. so I need to fully understand this.

Thanks in advance