  We propose a mechanism for calculating anomalous dimensions of higher-spin
twist-two operators in N=4 SYM. We consider the ratio of the two-point
functions of the operators and of their superconformal descendants or,
alternatively, of the three-point functions of the operators and of the
descendants with two protected half-BPS operators. These ratios are
proportional to the anomalous dimension and can be evaluated at n-1 loop in
order to determine the anomalous dimension at n loops. We illustrate the method
by reproducing the well-known one-loop result by doing only tree-level
calculations. We work out the complete form of the first-generation descendants
of the twist-two operators and the scalar sector of the second-generation
descendants.
