  The technique of truncated moments of parton distributions allows us to study
scaling violations without making any assumption on the shape of parton
distributions. The numerical implementation of the method is however difficult,
since the evolution equations for truncated moments are not diagonal. We
present a simple way to improve the efficiency of the numerical solution of the
evolution equations for truncated moments. As a result, the number of truncated
moments needed to achieve the required precision in the evolution is
significantly smaller than in the original formulation of the technique. The
method presented here can also be used to obtain the value of parton
distributions in terms of truncated moments, and therefore it can be viewed as
a technique for the solution of the Altarelli-Parisi equations.
