This research was conducted at PT. Mega Prakarsa Engineering Indonesia involving 153 respondents as customer representatives. The purpose of this study was to determine the role of mediation of customer satisfaction on the influence of service quality and social media marketing on customer loyalty. The results showed that service quality has a significant effect on customer satisfaction. Social media marketing has a significant effect on customer satisfaction. Service quality has a significant effect on customer loyalty. Social media marketing has a significant effect on customer loyalty. Customer satisfaction has a significant effect on customer loyalty. Service quality has a significant effect on customer loyalty through customer satisfaction. Social media marketing has a significant effect on customer loyalty through customer satisfaction.

Penelitian ini mengidentifikasi dua permasalahan dari diadopsinya asas praesumptio iustae causa dalam hukum acara peradilan tata usaha, pertama, justifikasi eksistensi asas tersebut, dan kedua, muatan putusan peradilan tata usaha negara yang tepat atas keputusan administrasi pemerintahan yang dianggap sah sampai pembatalannya. Untuk menjawab dua permasalahan tersebut digunakan tipe penelitian hukum doktrinal dengan pendekatan peraturan perundang-undangan dan pendekatan konseptual. Justifikasi asas praesumptio iustae causa berasal dari tesis keterpisahan dalam positivisme hukum yang berpandangan bahwa keabsahan norma hukum dan pembatalannya dependen pada hukum itu sendiri. Norma hukum hanya akan kehilangan keabsahannya jika ada norma hukum baru yang mencabut keabsahan norma hukum sebelumnya. Muatan putusan peradilan tata usaha negara yang tepat untuk merespon keputusan administrasi pemerintahan yang dianggap sah sampai pembatalannya adalah menyatakan keputusan administrasi pemerintahan dapat dibatalkan yang berarti keputusan dan akibat hukumnya berakhir sejak dinyatakan demikian dalam putusan peradilan tata usaha negara.
 
Kata kunci: asas praesumptio iustae causa; positivisme hukum; dapat dibatalkan

A person's readiness to enter the world of work after they finish vocational secondary education is not systematically prepared by educational institutions. at SMK Antonius Semarang. This research is a quantitative research design. The data collection technique that the author uses; documentation, observation and tests. After the data on students' speaking ability and work motivation were collected, the data were calculated statistically to determine the relationship between the two variables. They are the independent variable (X) and the dependent variable (Y), the independent variables are speaking ability and work motivation and the dependent variable is being included in the workforce.
The results showed that students' speaking ability significantly affected their readiness to enter the world of work as evidenced by the results of the T test for 14,892 which was greater than the t table (1,98) and had an effect of 71,1%. Work motivation has a significant effect simultaneously on their readiness to enter the world of work, as evidenced by the results of the T test of 33. 068 which is greater than the t table (1.98) and has an effect of
92.4%. While the results of students' speaking ability and motivation have a significant effect on working simultaneously on their readiness to enter the world of work as evidenced by the F test of 600.67 which is greater than F table (3.10) and has an effect of 92.4%.