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HEADINGcommon denominator of social task execution is the capability to launch atask to be executed by an open-ended community of performers and tomonitor its progress until completion.Finally, Process Mining is the less structured approach, where activities areexecuted freely and the process constraints are recovered a posteriori, by observingthe behavior of the actors, e.g., inspecting execution traces[vdAPS10].This Chapter addresses specifically participatory and social enactment.OVERVIEW OF THE APPROACHThe goal of the described work is to provide a method for the design, fastprototyping and deployment of BPM solutions extended with social interactions,which employs high-level models for representing both the BPM requirementsand the design of the process enactment application. Using modelsin all design stages grants important benefits: Process models are an intuitive yet formal way to represent businessprocess, which can be shared with non-technical stakeholders andformally checked for desirable properties. Application models describe the structure and behavior of an applicationindependently of the technical details of the deployment platform,can be formally verified for desirable properties, and used forquick prototyping and automatic code generation.Figure 2 shows schematically the phases and ingredients of the proposedmodel driven Social BPM solution development.The Process specification phase takes in input the business requirementsand workflow description of an organization and outputs a model of thebusiness processes that formally describes the organization of activities necessaryfor satisfying the business requirements. We assume that theprocess model is encoded in BPMN, extended to support the specification ofsocial interaction. The social process model can be used directly to produce aprototype of the enactment application, whereby a business analyst or astakeholder can: 1) impersonate any actor of the process, at all the levels ofsocial interaction; 2) start/suspend/resume/terminate the process activitiesin accordance with the process constraints; 3) create and inspect project artifactsand parameters, according to the process specification; 4) impersonateexternal user roles and simulate social actions.Social application design takes in input the Social BPMN model and producesin output a model of the application(s) needed for enacting it. The designphase is formally driven by model-to-model transformation rules, which dictatethe way in which each (social or conventional) BPMN construct has to beturned into a construct of the social application model. The output model isencoded in the WebML Domain Specific Language, extended with socialcomponents and patterns (Social WebML). A social component is defined asa DSL primitive that represents an atomic unit of business or interface logicused to perform a social interaction (e.g., a component can support the postingof a message in a social network wall; another component can supportthe registration of a user to the application using her profile in a social network).A social pattern is a fragment of application design that comprisesseveral components and connections to perform a full-fledged social activity4