This e-book provides examples of a varied set of interventionist research situations, including the selection of typical intervention methods and how knowledge contributions were extracted. The intention with this e-book is to concentrate our interest on a member of the action research family – intervention research – that can increase the relevance of management accounting research. More specifically, the e-book intends to open up this approach by providing further detail on how interventionist research is done and what its implications and consequences are. The idea is to equip future researchers with concrete insights on various aspects such as how to justify, how to start up, and how to organize interventionist research, while at the same time obtaining theoretical knowledge contributions from the vast ocean of real-time events and data.