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We aim at bringing together theorists and experimentalists actively working in the field, who will summarize the status of experimental findings of the last decade as well as new theoretical ideas and pin down the most challenging pending problems. The discussions should lead to a compelling priority list of theoretical as well as experimental activities in the near and midterm future. Key scientific questions addressed by the MIAPP programme The key questions of the proposed programme are related to the key questions in hadron physics, which in turn are vital in understanding of the subtle symmetry violation observed or sought for in heavy flavour decays. What is the excitation spectrum of light and heavy hadrons? Are all those states truly observed and what is the nature of seemingly superfluous states observed? What is the best description of the exotic hadrons: colour-neutral components (hadron molecules) or coloured subconstituents (e.g. diquarks)? What are the experimental signatures to tell one picture from another? What can we learn from the light meson spectrum about the heavy meson spectrum and vice versa? Can we build an excitation spectrum from observed heavy quarkonium states XYZ? How can the limits of QCD lattice calculations be pushed to make it capable of describing states decaying into various multiparticle final states? To what extent can dispersion theory be employed to allow for a proper description of heavy meson transition to a multipion final state? How to derive subtle understanding of confinement from spectroscopic data?