Documentation that will describe the features and functionalities of Ariba modules?

Hi All,

I would just like to ask if there are documents that will describe the features and functionalities of Ariba modules? I would specifically need details on the following modules: Ariba Buyer, Ariba Sourcing, Ariba Contract Management. I was looking for documentations that could understand by a non-technical person.

Thanks in advance for any inputs.

Regards, Larry