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Educational quality is one of the most important factors for having well-trained human resources that support the productivity, competitiveness, and economic growth of a nation. Teachers have always played dominant roles in ensuring education quality. Thus, teacher education is becoming ever more important. However, scholars have long warned about the ineffectiveness of teacher preparation. Indeed, a significant gap still exists between current pre-service teacher education and ideal training. Thus, a new professional performance evaluation system for pre-service teachers will be very helpful in resolving long-term public dissatisfaction with schools. To resolve this problem, developing a performance evaluation system that contains professional standards, performance evaluation criteria, and a precise performance evaluation mechanism is essential to guarantee the highest teacher quality in Taiwan. The authors designed a two-stage research effort for a professional performance evaluation system for Taiwanese pre-service teachers of automobile repair. In the first stage, the Delphi method is introduced to develop pre-service teachers&rsquo, professional standards and key evaluation criteria using two iterations of Delphi processes and 14 iterations of focus group meetings based on experts&rsquo, opinions. In the second stage, a professional performance evaluation and review mechanism for pre-service teachers is developed using focus group meetings to collect opinions from six vocational education experts. The final performance evaluation system will enhance the quality of pre-service teachers in vocational high schools and serve as a useful model for other countries and economies.

Many businesses nowadays are migrating from traditional enterprise telephone PSTN to VoIP because it combines voice, data, and video into a single, easy to manage service such that users are able to strongly secure their data. Research related to VoIP studies focuses on different issues from time to time. This study applies an integrated approach of main path analysis to explore the development and knowledge diffusion trajectories of the VoIP literature. We investigate thousands of papers in VoIP and visualize the knowledge diffusion trajectory of VoIP research via a social network analysis tool.