Abstract
Recent neutrino oscillation experiments have measured leptonic mixing angles with considerable precision. Many theoretical attempts to understand the peculiar mixing structure, observed in these measurements, are based on non-Abelian flavour symmetries. This talk concentrates exclusively on models based on the non-Abelian symmetry A4. A4 is particularly well suited to describe three family mixing, and allows to explain the near tri-bimaximal mixing observed. Special emphasis is put here on the discussion of the neutrinoless double beta decay observable 〈:mν〉. Different models based on A4 with very similar predictions for neutrino angles can yield vastly different expectations for 〈mν〉. Neutrinoless double beta decay can thus serve, in principle, as a discriminator between different neutrino mass models.
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