Abstract. Some theoretical (ETG, ITG) and empirical heat transport models are tested against a wide database of discharges heated with fast wave electron heating (FWEH) and discharges with combined auxiliary heating schemes (NBI, ICRH, LHCD) exhibiting an internal transport barrier (ITB). Both the interpretative and predictive transport are studied with the CRONOS code, which solves in a self-consistent manner the whole system of transport equations together with the current diffusion equation, the plasma equilibrium and sources. The results of the electron transport analysis strongly favor the electromagnetic turbulent models. The ITB discharges are analyzed by including the effects of magnetic and ExB shears. They are found to be satisfactorily simulated, in a pure predictive manner, by a mixed Bohm/gyroBohm model. Futhermore, both the interpretative and predictive simulations clearly stress the role of the current profile in the formation and robustness of the ITBs, consistent with the comprehensive analyses of drift wave stability using a linear gyro-kinetic code.