An important question for extrapolating the stability of fast particle driven modes on ITER is which is the most appropriate model to evaluate the wave damping by the background plasma. The different damping mechanisms of Alfvén Eigenmodes (AEs) are studied on JET by directly measuring damping rates, g/w, of stable AEs in different operating scenarios. Section 1 presents measurements of g/w for n = 1 Toroidal AEs (TAEs) in plasmas with different directions of the ion B-drift, showing a significant difference between the two. The link between the mode stability limit and the fast particle distributions is also investigated using direct observations of the fast particle driven AEs for the case of ICRH heated plasmas and measurements of the fast ion energy distribution function from a Neutral Particle Analyser (NPA). Measurements of this kind are reported in Section 2 for monochromatic and polychromatic ICRH scenarios.