We provide a new method for systematically structuring the top-down level of ontologies.
is based on an interactive, top--down knowledge acquisition
ocess, which assures that the knowledge engineer
nsiders all possible cases while avoiding redundant acquisition.
e method is suited especially for creating/merging the top
rt(s) of the ontologies, where high accuracy is required, and for supporting the merging of two (or more) ontologies on that level.

Topics in education are changing with an ever faster pace. E-Learning
sources tend to be more and more decentralised. Users need increasingly to be able to
e the resources of the web. For this, they should have tools for finding and organizing
formation in a decentral way. In this, paper, we show how an ontology-based tool
ite allows to make the most of the resources available on the web.