  An approach for an effective computer evaluation of one-loop multi-leg
diagrams is proposed. It's main feature is the combined use of several systems
- DIANA, FORM and MAPLE. As an application we consider the one-loop correction
to Higgs production in e+ e- to nu anti-nu H, which is important for future e+
e- colliders. To improve the stability of numerical evaluations a non-standard
basis of integrals is introduced by transforming integrals to higher
dimensions.
