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The change of the user's viewpoint in an immersive virtual environment, called locomotion, is one of the key components in a virtual reality interface. Effects of locomotion, such as simulator sickness or disorientation, depend on the specific design of the locomotion method and can influence the task performance as well as the overall acceptance of the virtual reality system. Thus, it is important that a locomotion method achieves the intended effects. The complexity of this task has increased with the growing number of locomotion methods and design choices in recent years. Locomotion taxonomies are classification schemes that group multiple locomotion methods and can aid in the design and selection of locomotion methods. Like locomotion methods themselves, there exist multiple locomotion taxonomies, each with a different focus and, consequently, a different possible outcome. However, there is little research that focuses on locomotion taxonomies. We performed a systematic literature review to provide an overview of possible locomotion taxonomies and analysis of possible decision criteria such as impact, common elements, and use cases for locomotion taxonomies. We aim to support future research on the design, choice, and evaluation of locomotion taxonomies and thereby support future research on virtual reality locomotion.

Background: Work engagement is a positive, signicant, work-related mental state that involves enthusiasm, dedication, and attention, and it has been shown to have a direct impact on care quality. Employees who are more involved in their work, usually experience less job stress and anxiety than those who are not; increased levels of work engagement can improve dental team performance, job satisfaction, emotional wellness, and minimize the likelihood of turnover. to evaluate work engagement of PHCC dentists and dental assista Objective: nts in Qatar. Method: An electronic questionnaire was emailed to the whole population of PHCC (217) dentists and (192) dental assistants distributed over 27 health centers and obtained from Dentistry Department data base after securing approval. Study design: quantitative, correlational, and cross - sectional study using instruments reecting sociodemographic variables and Utrecht Work Engagement Scale (UWES) that consists of three constructs: vigor, dedication, and absorption (Schaufeli et al (2002)). Results: 187 out of 409 dentists and dental assistant replied to the survey with response rate of 46%. 66.8% of respondents were males, 79.1% were married, 68.4% of participants were below 45 years, 51.9% had less than 5 years of work experience with PHCC. 80.2 % had general satisfaction with the profession, and 43.9% had thoughts of leaving the profession. Conclusion: PHCC general dentists and dental assistants demonstrated average and above of work engagement levels with total mean score of (3.99± 1.15 SD), Dental specialists (3.74±1.29 SD), GP dentists (4.22 ± 1.21 SD), dental assistants (3.95 ± 1.02 SD).