## 4 ARION: Experiment and Scenario of Use  
The Pilot use case chapter is remarkable and showcases a descriptive scenario of the Arion platform. With this scenario, all aspects can be thoroughly illustrated, including the benefits and reasons for using the Arion platform. An indicative scenario starts with a teacher whose schedule is a Learning session (an online version of a classroom lesson) on the IOLAOS platform for the GameHub [46] class. After the Learning Session is concluded, the Learning Analytics material generated by the IOLAOS platform, like screen or camera video and chat messages, are stored in the IOLAOS common data space [47]. The teacher's goal is to assess his/her decisions regarding the learning preferences assigned to the students who participated in the Learning session. To achieve this goal, the teacher joins the Arion platform to evaluate the learning process [48; 49] through the synchronization utility that the platform provides, utilizing the learning analytics materials stored by the IOLAOS platform during the learning session. As the first step after wrapping up the learning session in the IOLAOS platform, the teacher starts the evaluation process through the Arion platform. The teacher goes to the Arion platform synchronization utility's homepage and fills out the login form (Figure 3: Arion Platform login form. The teacher fills out the credentials needed to access the IOLAOS platform in that form, and authentication goes through the IOLAOS platform authentication system with the use of services. As it becomes apparent, every teacher (Arion user) must be registered on the IOLAOS platform at this implementation stage. Figure 2: ARION Component Diagram. After successful login, the teacher is responsible for or acts as an assistant. With that view, the teacher has an organized view of all the classes and can easily navigate to the correct class for which he/she aims to evaluate one or more learning sessions. The classes are displayed as cards in a grid view, as shown in Figure 4: Available Classes View, and they can choose through the card button to see the available learning session. Furthermore, after choosing the GameHub class from the available classes view Figure 4: Available Classes View, the teacher can see all the available learning sessions with some basic information about the creation date, the participants, the available videos, and chat messages like Figure 5: Available Class Learning sessions shows. After choosing our scenario's latest learning session, the teacher presses the view button to load the synchronization view with the available data from the learning session. Figure 4: Available Classes View. Figure 3: Arion Platform login form. Initially, the synchronization view (Open Studio) displays an empty player, similar to those found on video platforms such as YouTube, with two buttons that allow the teacher to create notes and view the notes he has already created. Additionally, as shown in Figure 6: Open Studio View, the top left corner appears to have a \"burger\" icon through which a menu of necessary tools is accessed. That view is a canvas for all the modalities of the platform. The platform supports various modalities, with video being utilized for screen captures and camera video. The studio view has three modalities (shown in Figure 7a): the chat modality allows the platform to display the chat for all or specific participants. The xAPI modality, a collection of statistics from the game participants, played throughout the learning session, and the emotions modality derived from the emotion API, shows the results of the emotion analysis of all videos and chats from the learning session. Figure 5: Available Class Learning sessions. Figure 6: Open Studio View. To access all those modalities, the user can click the burger icon from the top left of the U.I. interface, Figure 2:0 The user can enable the general modalities that he wishes, as shown in Figure 7a, and the user-specific modalities, as shown in Figure 7b, by selecting them.