# Interactive Teaching in Virtual Environments: Integrating Hardware in the Loop in a Brewing Process
## 5 Experimental Design
### System Satisfaction Testing  
Figure 14 shows in detail the results derived from the evaluation of the satisfaction of the proposed teaching-learning process for what is considered the interactive brewing system [31]. This comprehensive analysis focused on six key aspects--ease of use, comfort of use, intuitive system, accessible system, ease of understanding the information, and clarity of information--evaluated by a group of 20 students. The results reveal an overall positive perception, where ease of use scored a mean of 4.15 (standard deviation of 0.67), indicating a friendly interaction. Comfort of use achieved a mean score of 4.20 (deviation of 0.7), reflecting a comfortable and satisfactory experience. System intuitiveness received a rating of 4.40 (deviation of 0.60), highlighting its easy comprehension. Accessibility, with a mean of 4.40 (deviation of 0.68), demonstrated a smooth user experience. Ease of understanding the information scored 4.05 (deviation of 0.76), indicating a clear and understandable presentation. Although slightly lower, clarity of information maintained  
generated promising responses. Due to the active interaction of the students with the work environment, the effectiveness and usefulness of the proposed tool has been demonstrated, which establishes an innovative connection between the virtual work environment, the SCADA supervision system and the didactic module that represents the physical part of the industrial process through the HIL technique. Bi-lateral communication between the hardware and the software that controls the system significantly benefits the teaching-learning process by providing students with practical and applied experience in the field of industrial control and automation. The work environment offers a significant teaching method, due to the incorporation of the SCADA System, which allows real-time supervision and direct control of key variables. The real-time connection between the virtual environment and the physical plant becomes a valuable tool for a deep understanding of theoretical concepts, offering students the opportunity to directly experience in control principles in a simulated industrial environment. In terms of working time, the SCADA system stands out for its efficiency in data management and transmission. The implementation of the OPC protocol ensures fast and reliable communication between the SCADA and the S7-1200 PLC, optimizing synchronization and information exchange. This protocol, recognized for its robustness in industrial environments, contributes to the fluidity of the system, allowing real-time interaction that is crucial for the accurate simulation of industrial operations. Furthermore, the successful convergence between the virtual world and the physical plant in real time is presented as a significant and contextualized approach for learning complex industrial processes. On the other hand, the feedback obtained in terms of satisfaction and usability has yielded encouraging conclusions. The wide acceptance by users, reflected in a considerable degree of satisfaction, demonstrates the effectiveness of the implemented methodology. The usability of the system, evaluated through navigation, interactivity and feedback, has been rated as acceptable by users. The intuitive interface and control capabilities provided have facilitated the adoption of the system, contributing significantly to the achievement of the proposed learning objectives. Taking into account the inherent advantages of working in virtual environments, such as flexibility, security and the possibility of simulating different scenarios, this work lays the foundation for the continued development of teaching methodologies in the field of engineering. However, it is important to complement this significant teaching process with practical activities at an industrial level, which allow students to interact with equipment for their respective control and manipulation.