The Effect of Self-Efficacy and Assertive on Students' Business Negotiation and Communication Skills in Vocational High Schools (VHS), 545 Sriyanto Sriyanto 1 , Social Studies Department, Universitas Muhammadiyah Purwokerto, Indonesia. Indri Murniawaty 2 , Social Studies Department, Universitas Muhammadiyah Purwokerto, Indonesia. Dwi Puji Astuti 3 , Economic Education, Universitas Negeri Semarang, Semarang, Indonesia. Yudha Febrianta 4 , Social Studies Department, Universitas Muhammadiyah Purwokerto, Indonesia. Zainudin Hassan 5* , Universiti Teknologi Malaysia (UTM), Johor, Malaysia. Email: p-zainudin@utm.my International Journal of Early Childhood Special Education (INT-JECSE), 14(1) 2022, 545-554 DOI: 10.9756/INT-JECSE/V14I1.221067 Sriyanto Sriyanto, Indri Murniawaty, Dwi Puji Astuti, Yudha Febrianta, Zainudin Hassan. (2022). The Effect of Self-Efficacy and Assertive on Students' Business Negotiation and Communication Skills in Vocational High Schools (VHS). International Journal of Early Childhood Special Education (INT-JECSE), 14(1): 545-554. DOI: 10.9756/INT-JECSE/V14I1.221067 Received: 30.09.2021 Accepted: 16.12.2021 Abstract Communication and negotiation provide significant contribution to the success and achievement of an organization. This study aims to examine factors influencing students' negotiation and communication in the Online Business and Marketing Department of VHS. The data used a questionnaire of 426 respondents consisting of VHS students throughout Central Java, then processed using inferential statistical analysis with WARP PLS-SEM. The researchers obtain several findings, that is self-efficacy and assertive variables do not have significant contribution to the business communication variable. In contrast, self-efficacy and assertive variables have significant contribution to the negotiation variable. Similarly, both variables found have no indirect effect on the business communication variable. Eventually, this study finds that students' communication skills during their study go hand in hand with knowledge and attitudes. Keywords: Assertive, Social Skills, Communication, Negotiation, Self-efficacy. Introduction Communication is a psychological and social process when two or more people exchange attitudes, emotion, and information through the system of symbols, signs, or behaviors to create better understanding in an organizational structure (Ang et al., 2013; Chen and Tseng, 2016; Varey et al., 2002). Besides conveying informative messages, in communication, one needs to pay attention to its persuasiveness. It is because communication not only expresses what is written and spoken but also characters and ways of messages are conveyed to the interlocutors. Words are speeches delivered to listeners to do activities and actions. The listeners not only listen to statements said by the speakers but also read and assess their attitudes. The main requirement for effective communication is a strong character built on a strong ethical foundation and personal integrity. Abilities that speakers should have to make effective communication is the ability to be a listener, deliver message or information, and use various media appropriately (Conrad and Newberry, 2011). Communication is a competence and survival skill needed by students to live as good citizens and survive in their future work (Wagner, 2010). It becomes one of the interpersonal skills that emphasizes critical thinking and problem-solving abilities, collaboration and adaptive leadership, initiation and entrepreneurship, effective communication in Sriyanto Sriyanto 1 Indri Murniawaty 2 Dwi Puji Astuti 3 Yudha Febrianta 4 Zainudin Hassan 5* The Effect of Self-Efficacy and Assertive on Students' Business Negotiation and Communication Skills in Vocational High Schools (VHS)