We partition the perturbation phase space in the three-element discret
e nonlinear Schrodinger equation into symmetric and antisymmetric subs
paces. We then show that chaotic motion in the neighborhood of symmetr
ic trajectories is confined to the antisymmetric space. Chaos occurs i
n the system at arbitrarily low levels of nonlinearity, in agreement w
ith previous calculations. We call this phenomenon ''microchaos.''