The NFI assesses the changes and state of the forest as a basis for monitoring the forest development (BRÄNDLI 1993). A special interest here is given to the sustainability of forest influences with respect to human requirements, in other words, the permanent fulfillment of forest functions. This will only be ensured if the forest constantly regenerates itself enough or if it is regenerated by humans. Sustainable forest regeneration represents, therefore, a key measure in the evaluation of sustainable forest development.