| WP | Title | Coordinator | Institutes |
| 1 | Coordination and Communication | Roberto Losito (CERN) | CERN |
| 2 | Physics and Detectors Requirements | Donatella Lucchesi (UNIPD) | UNIPD, INFN, CEA, DESY, UOS, LIP, CERN |
| 3 | Proton Complex | Natalia Milas (ESS) | ESS, UU, CERN |
| 4 | Muon Production & Cooling | Chris Rogers (STFC – UKRI) | UKRI, Imperial, UWAR, CERN |
| 5 | High Energy Complex | Antoine Chancé (CEA) | CEA, INFN, CERN |
| 6 | RadioFrequency System | Dario Giove (INFN) | CEA, ULA, UROS, INFN, CERN, Strathclyde |
| 7 | Magnet Systems | Luca Bottura (CERN) | CERN, CEA, INFN, SOTON, TUDa, UTWENTE |
| 8 | Cooling cell Integration | Lucio Rossi (CERN) | UMIL, INFN, Imperial, CERN |
