This paper presents the results obtained in the process of evaluating a set of modeling elements for the specification of interactive systems, from the classifiers defined in the Activity Taxonomy (ATx). The intention is to find a correspondence between the classifiers defined in the taxonomy and selected modeling elements. The evaluation is also aimed at identify the modeling elements most commonly used by the expert community in Software Engineering (SI) and Human Computer Interaction (HCI). No attempts to measure the level of separation between these communities, because this is something obvious. Rather, what is intended is, from the Activity, an element that is common to all, consider the need to bring the HCI to the SI and vice versa, because after all, both focus on producing software. The final purpose of this research is to define a language that will be generic enough to represent the activity and will serve as a basis for defining executable languages within the framework of the design of interactive systems.