What are the four parts to an intruder alarm system?

control equipment, detection, user interaction and reporting. Im done now. Let me know how I did

Thank you very much Sir

Youve lost your 50/50 but you can still phone a friend acquaintance 

It's probably more simple I tend to under simplify

please don't use mine you will probably fail.

The four parts. If you breakdown a intruder alarm, what do you need to have a fully working system, James has given you some, and you have asked a question about one,

I have a 10 bedroom house and you are coming to quote for a new system, and order the parts from securitywarehouse, what would you need to order,

Hi WDT,  

All been sorted already  but thank you anyway for trying to get me on the right track. I really appreciate a hales from all guy here even those a bit sarcastic