Customer retention is much more than simply measuring how many customers are still active 12 months after they begin a relationship with your company. It’s much more than trying to please everybody who walks in the door or orders from your online store. It is, in fact, a perpetual process that is all about profitable allocation of limited resources. How best to focus your dollars to know where customers are in the buying cycle, what behaviors distinguish one customer from another and which customers are worthy of effort in moving them toward upward migration. The key and often overlooked component of retention is to have the discipline to ignore the disengaged.