This thesis examines the New Product Introduction (NPI) process at EssilorLuxottica, focusing on identifying inefficiencies and proposing improvements. The analysis spans the key stages of the NPI process, addressing challenges such as cross-functional coordination, scalability, and quality assurance, and balancing delivery KPIs. A case study on assembly challenges in crystal lenses highlights the practical implications of these issues, particularly emphasizing how process deviations can lead to production disruptions. Proposed solutions include creating an NPI Management Team, enhancing material testing and implementing a feedback database to improve the process. These measures aim to increase efficiency, reduce waste, and ensure a seamless transition from prototype to mass production.