The advantages of customer-centric business are well documented. Still, many companies struggle to center their customers in their strategies. Customer portfolio management provides a framework for achieving customer-centricity. Fred Selnes and Michael Johnson, in their new book Customer Portfolio Management: Creating Value with a Large Leaky Bucket of Customers, expand on this framework. They explain why customer retention strategies outperform acquisition-focused approaches. And they encourage companies to develop more sophisticated customer analytics beyond simple metrics.