Confusion and dissatisfaction during the use of software is no problem of the user but it is a symptom for bad design!

An important point for usability of a software system is the user interface. It has to offer all the systems functionality in an easy-to-use way by visualizing the system structure a user works on. On the other hand, the frontend needs a clearly defined connection to the application layer. So frontend design has to work in two directions: the user interface and the application interface.

The WEL is conceived as a web application. Therefore, there is a great number of technologies which can be used to build up the frontend. Beneath HTML/JavaScript as web basics, there is a series of specilized web formats, like Shockwave-Flash, QuickTime-VR, VRML (with there specific advantages and disadvantages), or Java as plateform independent programming language. All these technologies are tested in different combinations, in order to receive a platform independent and as generic as possible Interface.

Achievements of modern screendesign are used for visualisation, like the seperation of functions and actions, the spatial simulation of buttons and areas and workflow-based organization of the screen instead of a static design. In this way, clarity and functionality should be achieved and the user should be supported in the best possible way in navigating. An emphasis is the experiment of modularisation, in order to respond flexibly to different system configurations and user groups - and so to different functionalities.