HEADWORK: Powering the Crowd with Tuple Artifacts

In this demo we introduce Headwork, an open-source academic platform for the crowdsourcing of complex tasks. Besides classical crowdsourcing features, Headwork eases the development of crowdsourcing campaigns through a full relational abstraction of relevant concepts (participants, skills, tasks, current answers, decision procedures, GUI, etc.). It allows in particular the orchestration of complex dynamic tasks using so-called tuple artifacts (i.e. finite-state automata which transition guards and actions are SQL-defined, on an evolving database). The demo will illustrates these key features, both from the participant and developer point of view.