## 4 Results  
Overall, experts left positive evaluations of collaborative reviews of technical documentation in COVE-VR. Figure 7 shows how experts perceive the value of collaborative reviews in VR by visualizing the division of answers via minimum, maximum and median of the answers for each statement. All experts agreed that review sessions in VR would positively affect the company's overall performance, would accelerate the project span, and advance the knowledge transfer between the departments. Furthermore, eight experts agreed that collaborative review sessions in VR would help to identify more design errorsand that a VR review session is more efficient than reviews via traditional conferencing tools. Finally, all experts agreed that review sessions in VR should be integrated to the company's working practices. The results of the SUXES survey, which compares the expectations and experiences with the VR system, are shown in Figure 8.  
The application functions error-freely  
Figure 8: Expectations and experiences with VR platform. A seven-point Likert scale was used. Figure 7: The results of collaboration-related statements, answered on a seven-point Likert scale. The survey results show that for most of the statements, the expectations of subject matter experts were met. They also demonstrate the overall positive evaluation of the system's usability. Most of the experts found the system to be fast, pleasant, clear, easy to learn and natural to use, with a median at 5. In addition, all the participants found it to be useful. However, for about half of the experts, using the application was not effortless. The decrease between expectations and experiences happens in two statements--the experts expected the application to function less error-freely than experienced. In addition, less enthusiasm was demonstrated towards using the application in the future after experiencing it; however, no expert showed a negative attitude to this statement. Figure 9 demonstrates how experts evaluated the DocPanel tool. The tool was found to be useful for the review processes and easy to use. In addition, experts believed that the tool would positively affect the collaborative review process and make it easier, faster, and more efficient. The results also show that the tools should be further advanced in terms of design and interactions. The usefulness and benefits of VR technology to facilitate the collaborative review of technical documentation and the virtual tools were discussed in a semi-structured group interview. Despite the main focus of the interview being the DocPanel tool and the feasibility of the review process in VR, the participants were very engaged and gave many comments and improvement ideas on the other tools and the multiuser collaboration in general. The concept of the DocPanel tool was evaluated as very useful by experts participating in the user testing. When reviewing technical instructions, one must have access to the actual document files; therefore, the instructions must be available in the VR. Participants were able to use the DocPanel tool and review the instructions in it while checking the components in VR. However, participants suggested several functionalities and improvements to the DocPanel tool that would enhance the review process in VR. Firstly, better navigation features would be needed. The DocPanel tool had basic _next_ and _back_ functionalities, but all participants agreed that a _navigation pane_ or _table of contents_ would be needed to obtain a comprehensive view of the instructions and to easily navigate to different parts of the instructions. With the next and back buttons, you can move inside one task, but navigating  
Figure 9: Evaluation of the DocPanel tool for collaborative review in VR. A seven-point Likert scale was used. to a completely different part of the instruction is very cumbersome and laborious with them. The DocPanel had _page numbers_, but some participants commented that a _progress bar_ would be a more suitable indicator of the progress made while reviewing a task.