For its successfully evaluation, the didactic knowledge used to support the learning process one must first have an explicit representation. To do this, we propose a graph-oriented storyboard-concept is introduced to represent didactic knowledge. The storyboard concept is built upon standard concepts which enjoy both an appealing visual appearance (graphs) and an easy manipulation with standard tools (Microsoft Visio and the appropriate tools for the included learning material such as Microsoft Power Point, Adobe Reader, Windows Media Player or an Internet Browser, for example). After an introduction to the approach, storyboards can be developed, maintained and refined by topical teachers. Furthermore, the evaluation issue is facilitated through the use of storyboards. A discussion of current customs in evaluating learning processes reveals some weaknesses of current (not only e-) learning systems, making sophisticated evaluation technologies unsuitable. Here, the storyboard concept seems to be the key to addressing this issue, because the subject of evaluation becomes explicit and, thus, assessable through standard validation technologies. An approach to evaluation is proposed that allows both the communication of general assessments about the system's validity and the indication of the particular weaknesses in the system. Thus, the evaluation results may serve as a basis for the refinement of the didactic design. The talk will focus on using storyboards to represent the didactic content of an e-learning system, and how those storyboards could be used to evaluate and validate the didactic design of an e-learning system.