Best practice for large WCF service?

Question

What is the best practice for writing a rather large wcf service, containing a lot of OperationContracts and DataContracts?

How would I separate functional areas into se

Answer 1

I know this is an old post but I am thinking of services in the same way as I think of objects in programming.

Keep them to their bare minimum for what they must do. Of course not to go to the extreme, but I am making my decisions based on data entities.

One service for Account, one for Product etc.

Not sure what anyone would think of that though...