This study aims to further develop research on the Tripartite Education System (TES) for Thailand and the ASEAN region. The collaboration between governmental agencies, industries and education institutions (universities, technical colleges) in a Public-Private Partnership (PPP) has proven to be of benefit in achieving a workforce able to cope with the challenges of the labour market in an Industry 4.0 environment. However, there is still debate on how to organize the PPP specifically. This essay gives some insights into three variants of the Thai School-in-Factory (SiF) model implemented at the Rajamangala University of Technology Lanna, which will be called Collaboration A, Collaboration B and Collaboration C. The analyses are done by reviewing existing documents on the projects (such as Memorandums of Understanding), and the review will show similarities and differences in collaboration structure, elements and concepts, objectives, roles of educational institutes and industries, curriculum, and finally, criteria and processes for student selection. The three collaborations (A, B, and C) share similarities in collaboration structure, elements and objectives but differ in curriculum and student selection processes. Another difference lies in the process of selecting students to participate because Variant C does not include the participation responsibilities when the SiF was established. Despite these differences, all three collaborations involve the RMUTL acting as a facilitator between companies, educational institutions and the public. The findings of these comparative analyses will contribute to broadening the understanding of effective approaches while bridging the gap between academia and industry and preparing students for successful careers. Additionally, these analyses can be helpful as Thai best practices for the ASEAN region and especially the CLM countries.