  Neutrino oscillations reveal several small parameters, namely, $\theta_{13}$,
the solar mass splitting {\em vis-\`{a}-vis} the atmospheric one, and the
deviation of $\theta_{23}$ from maximal mixing. Can these small quantities all
be traced to a single source and, if so, how could that be tested? Here a
see-saw model for neutrino masses is presented wherein a dominant term
generates the atmospheric mass splitting with maximal mixing in this sector,
keeping $\theta_{13} = 0$ and zero solar splitting. A Type-I see-saw
perturbative contribution results in non-zero values of $\theta_{13}$, $\Delta
m^2_{solar}$, $\theta_{12}$, as well as allows $\theta_{23}$ to deviate from
$\pi/4$ in consistency with the data while interrelating them all. CP-violation
is a natural consequence and is large ($\delta \sim \pi/2, 3\pi/2$) for
inverted mass ordering. The model will be tested as precision on the neutrino
parameters is sharpened.
