In the context of N=4 super-Yang-Mills theory the integrable structure present
in the planar limit is not expected to survive inclusion if 1/N corrections. We argue that, perturbatively, the planar integrable structure gives information
about 1/N corrections as well. We describe the necessary computational details and
illustrate this technology with the computation of some tree level and 1-loop
3-point
functions. The same techniques can be used to compute higher loops anomalous
dimensions
if integrability is restricted to the 1-loop dilatation operator or if it is
not known
how to diagonalize the Hamiltonian of the higher loop integrable system.