In recent years, artificial intelligence tools have democratized and are more and more often used by people who are not experts in the field. For instance, systems based on rules or constraints require human expertise as input to replicate the desired behavior. Despite the explosion of new devices and new input paradigms, such as tablets and other touch interfaces, usability of these tools seems not to have taken advantage of these recent advances. In this article, we focus on a fuzzy expert system for which users want to enter rules. We use our industrial partnerships to define with current users their needs in terms of rule authoring. They expressed their will of more mobility, more modernism, less mathematics. We present our work that involves the use of new touch interfaces to capture a fuzzy rule with only one finger. We end this article by the evaluation of the GUI with a user panel.