Methods and apparatus, including computer program products, for forming deployment units. Groups of process components, each group characterizing software that is independently operable, are identified. Thereafter, a plurality of deployment units, each deployment unit associated with at least one identified group of process components are formed. Each process component is entirely included in exactly one deployment unit. In addition, each of the process components characterizes software implementing a respective and distinct business process, and each of the process components defines at least one respective service interface for interacting with other process components, wherein all communication and interaction between process components takes place through the respective interfaces of the process components.