For the implementation of the 2D GUI in the ARViewer a special library is used that provides various graphic elements. These elements can be combined to the entire graphic dependent on the current process data. This automatically created graphic is basically used as an overlay on the displayed video (see Fig. 6). There are two different views of the process data for the user. In the first view the entire process is visualized with each single process step and all general process information. In this way the user has an overview over the process and can see the erroneous steps.