This paper was presented at ISPIM Connects Fukuoka – Building on Innovation Tradition, Fukuoka, Japan on 2-5 December 2018. The publication is available to ISPIM members at www.ispim.org. 1 The Cross-disciplinary Collaborative NPD Process in HVA Plastic Products Attawut Kumkrong Technopreneurship and Innovation Management, Graduate School, Chulalongkorn University, Bangkok, Thailand E-mail: attawut.kumkrong@gmail.com Natcha Thawesaengskulthai* Department of Industrial Engineering, Faculty of Engineering, Chulalongkorn University, Bangkok, Thailand E-mail: natcha.t@chula.ac.th Chaipong Pongpanich Sasin Graduate Institute of Business Administration of Chulalongkorn University, Bangkok, Thailand E-mail chaipong.pongoanich@sasin.edu * Corresponding author Abstract: The cross-disciplinary collaboration in NPD is vital for the innovative high value products, especially in plastic products. However, the complexity of inter-firm collaboration, the success rate of NPD collaboration is low. The aim of this study is to draw the conceptual framework of the cross-disciplinarily collaborative NPD process for inter-firm product development process and to provide guideline of collaborative management by using critical literature review and cross-case analysis of the seven new plastic developed projects. Research concludes that the unique steps in NPD management process are (1) opportunity recognition from user innovation (2) parallel product development from each partner and then integration into product and (3) partner’s review after project completion. The alliance management process found that trust formation, benefit sharing, and conflict are crucial to collaborative success. The composition of collaborative NPD from this study was developed into collaborative canvas to use as a collaborative guideline. Keywords: Collaborative NPD; Alliance NPD; Collaborative network; Cross- disciplinary work; NPD process; Plastic products; Plastic development process. 1. Introduction Cross-disciplinary collaboration in new product development can be one of the sources of innovative high value products, especially plastic products. No single scientific