The purpose of this study was to describe planning, organizing, implementing, and evaluating the management of school cooperation relations with the business and industrial world at SMKN 1 Gambut and SMKN 1 Kertak Hanyar. This study uses a qualitative descriptive approach with a multi-site research design. Data were collected by interview, observation and documentation techniques. The subjects of this study were school principals, vice principals for public relations, heads of expertise departments, teachers, educators and business and industrial world who collaborated with SMKN 1 Gambut and SMKN 1 Kertak Hanyar. This study uses an interactive data analysis model from Miles and Huberman, with stages: data collection, data presentation, and drawing conclusions and checking the validity of the findings is carried out with credibility, dependability, and confirmability. After the data has been collected, it is done with a single site and then proceed with a cross-site analysis. The results obtained from this study indicate that the planning of school cooperation relationships as well as the business world and the industrial world that help the success of school collaboration programs, socialize the school to potential partners, select potential partners in accordance with the majors owned by the school. The organization formed and assigned by the school principal to form a Cooperation Team (Iduka Team) for the World of Industrial Work with the support of the vice principal and all school members, heads of departments, special job fair coordinators. The implementation of school collaboration actively establishes communication with the world of work, there is curriculum synchronization, student internships, there are guest teachers who are competent in their fields from school partners according to the majors in the school, teacher education and training, equalization of facilities and infrastructure and school efforts to convince school partners, by fostering good communication with school partners, as well as recruiting alumni students working with partners to provide jobs according to the competencies students have. Thus, after graduating from SMK, students are able to be absorbed by the world of business and the industrial world and are ready to work according to the needs of the world of work. Evaluation of the school's collaborative relationship with the business or industrial world at SMKN 1 Gambut and SMKN 1 Kertak Hanyar.