mass assembly on the evolution of galaxies mapping the effects of the environment in the cluster outskirts and along the filaments with the aim to identify the very first interactions between galaxies and their environment.

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:   To identify and measure signs of ongoing transformation in galaxies belonging to a complex structure with the goal of improving our comprehension of what drives their star-formation quenching and structural modification.

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:   To obtain detailed maps of the dark matter and baryonic matter distributions (galaxies, ICM), combining weak lensing, X-ray and dynamical analyses.

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:   To quantify the variation in the stellar mass fractions going from cluster cores to groups, by comparing the near-infrared light distribution with the dark matter maps and dynamical masses.

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:   To build up a multi-band homogeneous data-set on this area of the sky made of sub-kiloparsec resolution imaging and magnitude-limited spectroscopy, thus providing the community with a solid background for studies of the Shapley supercluster.

To address the above objectives we will explore the global and internal properties of galaxy populations extending outside the cluster/group virial radius and aim for an accurate characterization of the environment. This will be defined through galaxy density, dark matter distribution, 