Today's business environment is constantly changing: New customer require­ ments or products, an evolving competition, new IT solutions like EAl or web services, outsourcing opportunities, mergers & acquisitions or changing legal re­ quirements are just a few reasons for this change. Intra and inter-enterprise proc­ esses of enterprises have to change accordingly. Therefore organizations have to ensure an efficient and effective business process change management in order to stay competitive and survive on the long term. This is a precondition to achieve and maintain business process excellence. However, the execution of successful change management has been extremely dif­ ficult. Many initiatives failed because of an unclear scooping and a missing defi­ nition of deliverables. Only the comprehensive design of the business processes to be improved creates a basis for a focused management of change. Change man­ agement can then be handled as a process by itself. It becomes measurable and can be controlled. It is an integral part of business process lifecycle management. Key-enabler is the ARIS Toolset which supports all activities of the process and change management: Business strategies, the resulting process specifications and execution as well as the process controlling are executed by using ARIS tools - in the phase of change as well as during the daily operation.