Abstract: Energetic particle (EP) transport in fusion devices is a multi-spatiotemporal-scale process due to the crucially important role played by EPs as mediators of cross scale couplings. This makes predictive analyses based on first principle computations very challenging and calls for reduced descriptions, which preserve the necessary physics ingredients. The present project proposes to adopt a multi-level approach, introducing controlled assumptions and increasing simplifications, eventually resulting into a hierarchy of reduced transport models. It is articulated in three main areas: (i) the formulation of the reduced description of EP transport in fusion devices; (ii) the implementation of a numerical framework for solving transport equations coupled with the dynamic evolution of the fluctuation spectrum; (iii) the comparison of the reduced model description with numerical simulation results from comprehensive nonlinear gyrokinetic and hybrid codes in a number of reference/paradigm problems adopted as benchmark cases. The final goal and deliverable of the present project proposal is demonstrating the validity and range of applicability of the developed EP transport models.