In Coremetrics we have a basic funnel of view product, cart product, buy product.

There are metrics for product views, items added and items sold.

There are metrics for unique viewers, unique adders and unique buyers.

But at the session level we only have viewing sessions and buying sessions.

It would be helpul to have the session level metric of "carting sessions" or "adding sessions" so that we could have better insight into session level interaction with products.