# Enhancing Industrial Processes Through Augmented Reality: A Scoping Review
## 4 Discussion  
_Research Questions_  
The 38 articles selected above contain sufficient information to make a scientific judgment regarding the optimisation of industrial processes through the application of AR. The questions posed in Section 2 are answered below. **RQ1:** Implementing AR in industrial processes offers a wide range of benefits that contribute to the optimisation and efficiency of operations. These benefits include error and time reduction [20; 21], as AR enables error identification and avoidance, significantly reducing the error rate in tasks such as assembly [22] and inspection. In addition, task execution times are significantly reduced, as seen in the reduction in design and assembly time, and in the completion of maintenance tasks. AR also contributes to increased efficiency and productivity. This technology helps operators understand design procedures by overlaying virtual information and instructions on the real environment, facilitating the completion of complex tasks. The system allows both hands of the picker to remain free and reduces cognitive load, thus improving work efficiency and productivity. In terms of training, AR allows training to be conducted in a dedicated environment, minimising disruption to daily operations and improving overall efficiency. In addition, it enables accurate and guided visualisation of procedures, reducing human error and accelerating the learning process. Maintenance optimisation is another key benefit [23; 24]. The adaptive mode of AR enables users to recognise faults faster and with fewer movements, improving efficiency and reducing downtime. AR provides contextual and meaningful information automatically, enabling faster and more efficient maintenance of equipment. Improved work and product quality is evident with the use of AR, as accuracy in tasks such as welding and quality control is increased, reducing variability and improving quality standards. AR also reduces the need for additional communications between workers, streamlining the process of video annotation and other documentation procedures. In terms of cost reduction, early detection of errors during assembly through AR prevents major problems, significantly reducing repair and rework costs. AR offers opportunities for continuous performance improvement, which can lead to significant savings in long-term operating costs. AR also facilitates improved communication and data management with online databases, allowing real-time access, editing and sharing. Similarly, AR provides a 3D visual representation of components and processes, which improves understanding and accuracy in the execution of tasks. Finally, AR increases safety by generating visual signals that warn workers of hazards in their environment, improving safety and reducing the risk of accidents. In addition, it provides a safe and controlled training environment, where users can practise emergency situations without real risks. **RQ2:** The most widely used graphics engine for developing AR systems is Unity 3D [20; 25; 26]. Unity 3D is a widely used graphics engine for developing AR applications in video games, simulations and interactive 2D and 3D experiences. Developed by Unity Technologies, this engine allows developers to create visually sturnning and highly interactive content efficiently. One of its main advantages is its ease of use, thanks to its intuitive interface and extensive library of resources and tools that facilitate the creation of graphics and the programming of behaviors. Unity 3D supports multiple platforms, allowing developers to launch their applications on operating systems such as Windows, macOS, iOS, Android, and video game consoles, among others. The Unity 3D graphics engine is a complete development platform that provides the tools and environment necessary to create, design and run interactive and visual applications. A graphics engine includes capabilities for handling graphics, physics, audio, animations, artificial intelligence, and other essential components for application development.