With BI having become a mainstream topic in both business and IT, the lack of a decent business case is increasingly unacceptable. As justified and as noble a cause as better decision-making is, faith is not a business case – certainly not for a topic as high up on the CIO agenda as BI. This white paper describes how to build a better business case for BI, by understanding the level of ambition organizations can have and the layers in the business case that should contribute to that level of ambition.