E. Vigezzi is a former Director of Research at the Istituto Nazionale di Fisica Nucleare (INFN) based in Milano, Italy. As a specialist in theoretical nuclear structure, one of his main research interests addresses the variety of elementary modes of excitation and the interactions between them, their effects on pairing correlations and their study by direct reactions.F. Barranco is a Full Professor at the University of Seville, Spain. He is a specialist in nuclear structure theory, with an emphasis in the study of pairing and collective effects on low-energy spectra. He has made important contributions to the recent developments in nuclear field theory, especially concerning its application to a variety of weakly-bound systems. G. Potel has recently joined the University of Seville, after being appointed at the Facility of Rare Isotopes Beams (FRIB), in Michigan, and at the Lawrence Livermore National Laboratory, in California. He is a specialist in nuclear reaction theory, and in its connections to nuclear structure. In particular, he has worked extensively on the theoretical description of two-nucleon transfer processes in connection with the experimental study of pairing phenomena in nuclei.