"The central goal of the ""COHERENCE"" network is the training of Early Stage Researchers (ESRs) and Experienced Researchers (ERs) to the highest level of international excellence within the rapidly growing field of electronically highly excited (Rydberg) gases and aggregates. The systems range from single atoms to large mesoscopic ensembles with full control over motional and internal degrees of freedom. Recent scientific progress has primarily been made by a number of European experimental and theoretical groups which are all assembled within the network. The field of Rydberg gases is at the crossroads between various scientific areas, including condensed matter physics, biophysics, molecular physics, quantum optics and quantum information, surface science, plasma physics, and laser technology. As perspective applications of Rydberg systems are already in sight, two optics and laser development companies have joined the network delivering technological expertise and in-depth training in business matters.The elaborate and well-structured training programme includes a schedule of workshops, schools, and conferences. The training will be strongly focused on the individual researchers by assigning each of them an international Thesis Advisory Board and by designing Individual Career Development Plans. Based on the interdisciplinary character of the research, the training content will include a blend of broad scientific, technological, and complimentary skills providing excellent perspectives for successful careers in both academia and industry. ESRs will also profit from the extensive exchage programme among the participating teams based on cotutelles, short- and long-term secondments. The ""COHERENCE"" network will thus ensure that Europe maintains the leading role within an important area of research and will stimulate transformation of the generated knowledge into new technologies."