University of Oxford - Information Systems Group, Athens University of Economics and Business, National and Kapodistrian University of Athens, University of Lubeck, National and Kapodistrian University of Athens - Department of Informatics and Telecommunications, University of Lubeck, National and Kapodistrian University of Athens, Ocado Technology, National and Kapodistrian University of Athens - Department of Informatics and Telecommunications, Siemens Corporate Technology and University of Lubeck

Ocado Technology, University of Oxford - Information Systems Group, Free University of Bozen-Bolzano - Faculty of Computer Science and Free University of Bozen-Bolzano - Faculty of Computer Science

University of Oxford - Information Systems Group, Siemens Corporate Technology, Free University of Bozen-Bolzano - Faculty of Computer Science, Free University of Bozen-Bolzano - KRDB Research Centre, Free University of Bozen-Bolzano - Faculty of Computer Science and Siemens Corporate Technology

University of Oxford - Information Systems Group, National and Kapodistrian University of Athens, Siemens Corporate Technology, University of Lubeck, University of Lubeck, Siemens Corporate Technology, Siemens Corporate Technology, Norwegian University of Science and Technology (NTNU), National and Kapodistrian University of Athens, Siemens Corporate Technology, University of Oslo - Department of Informatics (UiO), National and Kapodistrian University of Athens - Department of Informatics and Telecommunications, Siemens Corporate Technology, University of Lubeck, Athens University of Economics and Business and University of Oslo - Department of Informatics (UiO)

University of Oxford - Information Systems Group, National and Kapodistrian University of Athens, University of Oslo - Department of Informatics (UiO), University of Oslo - Department of Informatics (UiO), Free University of Bozen-Bolzano - KRDB Research Centre, Statoil, Free University of Bozen-Bolzano - KRDB Research Centre, University of Oslo - Department of Informatics (UiO), Norwegian University of Science and Technology (NTNU), Free University of Bozen-Bolzano - KRDB Research Centre, University of Oxford - Information Systems Group, University of Oslo - Department of Informatics (UiO), National and Kapodistrian University of Athens - Department of Informatics and Telecommunications, Athens University of Economics and Business, National and Kapodistrian University of Athens - Department of Informatics and Telecommunications and University of Oslo - Department of Informatics (UiO)

Pontifical Catholic University of Chile - Department of Computer Science, University of Maryland - MIND Lab, University of Oxford - Information Systems Group, University of Oxford - Information Systems Group and University of Oxford - Information Systems Group