During the 1990s, companies spent large amounts on IT investments without clear business cases. This document discusses managing IT as a business to ensure investments are aligned with business goals and deliver value. It argues the CIO must treat IT as a mainstream business, connect IT to corporate strategy, and focus on customer service, quality and performance. The CIO should also demand business units justify IT needs and pay for resources themselves. By integrating IT strategy with overall business strategy and focusing on profitability drivers, companies can better manage IT as a business.