Working Group Coordinator: Maria Grazia Pia (INFN Genova)
| Haifa Abdelwahed | Development, Test, Validation | To be confirmed (INFN fellowship) | |
| Stéphane Chauvie | Santa Croce e Carle Hospital Cuneo and INFN Genova | Development, Test, validation | |
| Anton Lechner | CERN and Technical Univ. Wien, student | Development, Test, Validation | |
| Francesco Longo | INFN Trieste | Development, Test, Validation | |
| Alfonso Mantero | INFN Genova, student | Development, Test, Validation | |
| Petteri Nieminen | ESA | Scientific Advisor | |
| Luciano Pandola | INFN LNGS | Development, Test, Validation | |
| Sandra Parlati | INFN LNGS | QA (maintenance of validation test infrastructure) | support role |
| Andreas Pfeiffer | CERN | Analysis Tools for test and validation | |
| Maria Grazia Pia | INFN Genova | OOAD, Development, Test, Validation, Coodination | |
| Pedro Rodrigues | LIP, student | Development | (position to be confirmed after PhD) |
| Manju Sudhakar | INFN | Development, Test, Validation | INFN post-doctoral fellowship starts in 2008 |
| Andreia Trindade | LIP | Development | (position to be confirmed after PhD) |
Other collaborators' formal engagement under discussion.