The objective of this essential work by Daniel Schallmo is to describe the key approaches to business model development from the years 2000 to 2009. The existing approaches differ in aspects such as the level of detail, methodology, and techniques, and there is no comparative overview of them. To address this, the author applies a uniform descriptive framework through which the existing approaches are analyzed. He then summarizes the analyzed approaches and compares them to highlight similarities and differences. As a result, there is an overview and analysis of existing approaches to business model development from 2000 to 2009.