Authoring of concept-based Web courseware is more complicated than the 'standard' courseware authoring and thus needs more adaptive and intelligent support. In order to provide such support the authoring system itself needs to have understanding about the process of courseware authoring, to be able to decompose it in steps and procedures and reason over it; to provide hints and recommendations to the author, and perform various (semi-) automatic actions. Our goal is to develop a knowledge-based system for concept-based courseware authoring, where the knowledge representation is realized with the help of Courseware Authoring Tasks Ontology (CATO).