Methods and apparatus, including computer program products, to realize a software model are described. A user-centric modeling component is defined, the user-centric modeling component modeling an interactive software system and including a plurality of process steps, the plurality of process steps defining a business scenario. For each process step in the plurality of process steps one or more service requirements are identified, where a service requirement represents functionality necessary to accomplish a step. For each service requirement a process component capable of providing the service requirement is identified, the process component modeling software implementing a business process and defining a service operation for providing the service requirement and for interacting with other process components.