Survey System with SOA?

Can anyone tell me how to implement a simple survey system in terms of SOA?

Lets say:

We have a website, where user logins in and takes the survey. Results of survey are stored into Database. once Survey is done, user sees a thank you page/

I am trying make system very simple here, so one can explain me how to implement SOA. We have lot more complecated system to implement.

I just need to see how to implement SOA.

Any other sample or example of complete SOA will be helpful.

Thanks,No body can help me out with small sample application with SOA?

I don't need anyone to design Survey System with SOA, but any simple small app with SOA example will be helpful.

Thanks