On this first version of our MR solution, we carried out a heuristic analysis to optimize its usability by minimizing design flaws before presenting the prototype to the first users. We used Jakob Nielsen's 10 heuristics, and Bastien and Scapin's criteria . This enabled us to modify the positions of the buttons within the panels, and reduce the workload by eliminating certain information that was unnecessary for the user or by reducing the number of actions required for each step. Then, each panel showed the instructions to assist the user, and display input parameters for obtaining an electrode with the desired properties. To use this technology, users had to reproduce the electrode of their choice and enter the numeric data using a numeric keypad (they could not enter the wording).