In hadron physics, several forefront experiments are either currently running or are planned to run at European facilities. Hadron physics experiments and studies are among the highest scientific priorities also in the USA and Japan. The close collaboration between theorists and experimentalists in sharing physics ideas, data analysis procedures, and proposals for new  experiments is one of the driving forces in hadron physics. Improving the performance of particle detectors, data acquisition systems, including their sophisticated electronic read-out systems, is one of the chief goals in hadron experimental physics, as well as optimising the computational capabilities and devising new computational tools. Worldwide, intense research and development activities are also directed towards designing advanced particle accelerators.

The HadronPhysics3 Integrating Activity (IA) aims at coordinating the existing, and fast expanding, hadron physics scientific community to make best use, and help develop the potential, of the most important Research Infrastructures in the field in Europe.

HadronPhysics3 will profit from the success of the previous Integrated Infrastructure Initiative (I3) HadronPhysics in FP6, and the current HadronPhysics2 IA in FP7, which have been instrumental in promoting the field. The current project represents a logical continuation and expansion of these I3s or IAs. HadronPhysics2 and 3 are strictly related; most projects in HadronPhysics2 were originally planned for a longer duration than finally granted. In this respect, the new 3-year project HadronPhysics3 will allow the completion of otherwise unfinished work. There are however entirely new projects in HadronPhysics3 such as the Network feasibility study for a new Electron Nucleon Collider (ENC) in Europe and the JRA to develop a novel RICH detector prototype for experiments at the upgraded JLab in the USA, where a number of European researchers play a leading role.

The HadronPhysics3 IA involves more than 2.500 scientists at a large number of universities and research institutes in Europe, corresponding to a total effort of about 730 full time equivalents (FTEs). The project is centred around five European Research Infrastructures (RI) offering transnational access. It is further structured into nine Networking Activities plus the management of the Consortium and fourteen Joint Research Activities. Links with leading non-European laboratories and researchers regarding direct participation and scientific collaborations contribute to the activities in HadronPhysics3.