- Article
18 Pages
This work details the design, technical deployment, and empirical validation of X-MAIN (eXtended Reality for Maintenance and Inspection Training), an Extended Reality (XR) environment designed for preventive maintenance and safety protocols in industrial robotics. By replacing physical robotic cells with a safe and highly repeatable virtual workshop, X-MAIN enables learners to perform hands-on tool manipulation and fault diagnostics without relying on physical hardware availability or real-time supervision. The framework is structured into a Simulation Zone for operational checks and a Maintenance Zone for hands-on tasks, governed by a generic, rule-matrix pair-based interaction model that formalizes user actions as tool–target pairs across Virtual Reality (VR) and desktop deployments. To evaluate its efficacy, a counterbalanced cross-over pilot study was conducted with a cohort of technical vocational students in immersive VR mode. Quantitative results demonstrate statistically significant technical knowledge acquisition. System usability assessments yielded a highly favorable Net Promoter Score of , while subjective workload mapping via an adapted NASA-TLX index confirmed low frustration levels and optimal cognitive engagement. Automated event-driven telemetry further substantiates system efficacy through low procedural error rates and high diagnostic accuracy (75.8%).
Virtual Worlds
24 September 2026







![Conceptual framework that shows the relationships between the key theoretical and methodological constructs of the study. Solid arrows (→) are used for direct instructional or measurement relationships, and dashed arrows (- - →) are used for theoretical grounding. The pedagogical design of the virtual world development course is based on the Cognitive Load Theory [18] and the Cognitive Theory of Multimedia Learning [22] and the cognitive demands of the course are measured with the NASA-TLX [24].](https://mdpi-res.com/cdn-cgi/image/width=281%2Cheight=192/https://mdpi-res.com/virtualworlds/virtualworlds-05-00022/article_deploy/html/images/virtualworlds-05-00022-g001-550.jpg)

