The Enterprise Dynamics Sourcebook presents frameworks and analytical models of the enterprise as a complex system to improve reader's understanding of its dynamic elements and their interactions. This sourcebook is the product of MITRE-sponsored research on enterprise dynamics and the range of applications pertaining to enterprise transformation programs. Filled with examples, it provides the understanding of the qualitative and quantitative data-analytic methods required to reduce risk and failure rates and enable an organization to operate effectively in today's complex and ever-changing environment.