This book breaks the boundaries of the single enterprise, proposing the symbiotic business model, and discussing business model design engineering as well as other new concepts, methods and ideas. Business models are not only dependent on business intuition, but also on systematic design and continuous upgrade. This book presents qualitative methods, such as the theory and principles of business model design; quantitative methods, for example the business-model based "Accounting Method"; and the "Financial Analysis Method," based on the business ecosystem. These methods help entrepreneurs and managers design better business models to further develop enterprises and make them more successful.