Book excerpt: In a time of extraordinary fiscal and national security uncertainty, it seems naïve to assume that all, or even most, of a strategic leader¿s current assumptions will be just as relevant several years into the future. This monograph highlights the need for Army senior leaders, in the midst of change, to periodically question their deep-seated beliefs on critical issues¿and perhaps change their minds¿rather than relying solely on what they have long believed to be true.