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Compared to the other neutrino mixing angles \theta_{13} is small. The solarmass splitting is about two orders smaller than the atmospheric splitting. Weshow that it is possible that both are perturbative effects on a more symmetricstructure. The perturbation also affects the solar mixing angle and can makealternate mixing patterns such as tribimaximal, bimaximal, or other variantsequally viable. For real perturbations this can be accomplished only for normalmass ordering and with the lightest neutrino mass less than 10^{-2} eV. Bothmass orderings can be accommodated by going over to complex perturbationsprovided the lightest neutrino is heavier. The CP-phase in the lepton sectorthat emerges distinguishes between different mixing models.

Smallness of \theta_{13} and the size of the Solar Mass Splitting: Are they related?