This study is aimed to analyze advantages of problem based learning and argumentation (PBLA) for vocational school students; and (2) analyze the implementation of PBLA to improve the critical thinking skills of vocational school students. This was library research which used secondary data sources and were collected through scientific articles, books, websites, and other relevant sources. Furthermore, the data were analyzed qualitatively with the Miles and Huberman model, which consisted of data collection, data reduction, data presentation, and concluding. From the results of the literature study, several conclusions can be drawn which include: (1) the implementation of PBLA has the potential to provide benefits both in terms of experience, motivation, innovation, and improvement of 21st Century vocational school student skills; and (2) PBLA supplementation will be very effective in increasing sudents'critical thinking skills if the teacher can direct students to be able to learn actively through various activities such as stating problems, discussing, arguing, concluding solutions, and evaluating.

Students’ critical thinking skills cannot develop appropriately if in the learning process, the teacher is not active. Therefore, to improve students’ critical thinking skills, a teacher should choose and use strategies, approaches, and methods techniques that involve students actively in learning, both in manner mental, physical, and social. One alternative learning that provides opportunities for students to develop students’ critical thinking skills in problem solving is problem-based learning. This research was a research study literature examining related journal application of problem-based learning to improve critical thinking skills. The findings of this study included: (1) the implementation of PBL has the potential to help students motivate and provide learning experiences; and (2) PBL implementation is very useful in improving students’ critical thinking skills, provided that teachers and students can apply each stage of PBL well.

With the enactment of the ASEAN Economic Community, it allows increased mobility and competition for labor freely among ASEAN member countries. This is a challenge for the Government of Indonesia to produce vocational graduates who are competent and highly competitive through Presidential Instruction No. 9 of 2016 concerning Revitalization of Vocational Schools. Based on the direction of the vocational education policy, several questions arise as follows: (1) what is meant by the competency certification test?;(2) what is the purpose of the competency certification test?;(3) what benefits will be obtained by carrying out the competency certification test?; and (4) what are the implications of the competency certification test on the work readiness of vocational graduates? This research is carried out through a literature review of the implementation of competency tests in several relevant vocational schools. Research concludes: (1) competency certification test is an assessment of individual performance, about how far the person concerned has been able to demonstrate knowledge and skills in their field; (2) the purpose of the competency certification test is to ensure students or vocational graduates can do work with industry-determined standards; (3) the benefits of competency certification are in recognition of the workforce in accordance with the required work competency standards; and (4) the implications of the certification test on work readiness of vocational graduates is that the level of work readiness of vocational graduates increases so that the opportunity to immediately get a job becomes higher.

This research aims to develop psychomotoric instruments adapted to the current conditions of Covid-19. Development research was carried out with reference to the 4D model from Thiagarajan. The research sample used was 39 students of the Ottimmo International MasterGourmet Academy. The research instrument used a validation sheet from validators or experts. Data of the research were obtained based on the results of the validation of the experts, which were then analyzed to determine the validity and reliability of the developed psychomotoric instruments. The findings of study indicated that the results of (1) the validation got an average value of 4.61 with a very valid category; and (2) reliability got a value of 0.671 in the reliable category. The conclusion of the research shows that the developed psychomotoric instrument is suitable for use in service and beverage learning.

In the new normal era, many company leaders have restarted their business places for economic turnaround. The workplace has a major contribution to the spread of COVID-19 so efforts need to be made to break the chain of transmission. The workplace is a gathering place for a number of working populations and mobility is so high, work activities also lead to worker interaction. This community service aims to giving knowledge how to prevent COVID-19 transmission in offi ce or industry and giving knowledge how to make beverage rich in antioxidant and vitamin C to boost immune system. This community service consists of several steps including the preparation step which includes determining the time for the implementation of counseling, making material modules, making fl yers and distributing fl yers. The next step is the implementation step which includes the delivery of material, questions and answers regarding extension materials and demonstrations of making Lemongrass Coolant. The implementation step was done by zoom online media the fi nal step of this activity is evaluation by fi lling the questions using Google Form. The participants were 41 people who work as lecturer, human resources department, undergraduate students, government employees, etc. Prevention of COVID-19 transmission is carried out by complying with the guidelines for the Decree of the Minister of Health of the Republic of Indonesia Number HK. 01.07/MENKES/328/2020. Making Lemongrass Coolant as a healthy drink rich in antioxidants as an immune booster does not require expensive ingredients and is also easy to manufacture. The participants joined in this community service with enthusiasm as evidenced by the many questions asked to the speakers.