Improving the quality of performance of Small and Medium Enterprises (SME) requires an entrepreneurial behavior approach, so this paper aims to explore, analyze and test Entrepreneurship behavior on the performance of small and medium enterprises and find the role of moderating entrepreneurial knowledge of small and medium business owners in Medan, to overcome the dynamics of the Revolution 4.0 is a threat to SME in the city of Medan, so that SME can increase the potential of entrepreneurial behavior in moving businesses to survive in a malicious era. The research approach used is the analysis of case studies on SME, which operate in the city of Medan. This study used a sample of 210 as SME owners, with a data analysis approach using the Structural Equation Model Part Least Square (SEM-PLS). The results of this study indicate that entrepreneurial behavior has a positive effect on the performance of SME, indicators that have the potential to be improved are work ethic, motivation, business instincts, unyielding creativity, initiative, energetic, and entrepreneurial knowledge are very important benchmarks to strengthen SME performance, The originality of this research is one model of quality of business performance with a behavioral approach and the role of moderating entrepreneurial knowledge is very important for SME owners, so it is important for small and medium entrepreneurs not to understand the concepts and practices of entrepreneurship to improve SME Human Resources.

This study aims to investigate the effect of the marketing mix and service quality on tourist satisfaction and loyalty. The data collection techniques used in this study included interviews and questionnaires to the relevant parties. The technique of data analysis in this study was descriptive and Structural Equation Modelling (SEM). The results showed that the marketing mix had a positive and significant effect on tourists satisfaction. The service quality had a positive and significant effect on tourists satisfaction in the region of Samosir. Marketing mix had a positive and significant effect on tourists loyalty. The service quality had a positive and significant effect on tourists loyalty. Tourist satisfaction had a positive and significant effect on tourists loyalty in the region of Samosir. And the marketing mix and the service quality had a significant effect on tourists in the Samosir Region through tourist satisfaction.

This study aims to analyze the effect of job satisfaction on lecturer organizational commitment and performance, and to analyze the mediating role of organizational commitment to the effect of job satisfaction on lecturer performance. This research was conducted at the Universitas Muhammadiyah Sumatera Utara (UMSU) and the Universitas Muslim Nusantara (UMN) Al Washliyah in Medan. The population is 425 permanent lecturers who hold functional positions at the two universities, and the sample was determined as many as 219 people. Data were collected by interview and questionnaire techniques. Path analysis is used to analyze data, and shows that job satisfaction is proven to have a significant direct effect both on organizational commitment and on lecturer performance. Organizational commitment is also proven to have a direct and significant effect on performance. However. the test results show that job satisfaction does not support lecturer performance when mediated through organizational commitment.

This study aims to investigate the effect of the marketing mix and service quality on tourist satisfaction and loyalty. The data collection techniques used in this study included interviews and questionnaires to the relevant parties. The technique of data analysis in this study was descriptive and Structural Equation Modelling (SEM). The results showed that the marketing mix had a positive and significant effect on tourists satisfaction. The service quality had a positive and significant effect on tourists satisfaction in the region of Samosir. Marketing mix had a positive and significant effect on tourists loyalty. The service quality had a positive and significant effect on tourists loyalty. Tourist satisfaction had a positive and significant effect on tourists loyalty in the region of Samosir. And the marketing mix and the service quality had a significant effect on tourists in the Samosir Region through tourist satisfaction.