Manufacturing and service organisations have repeatedly stressed the importance of knowledge management and sharing as an integral part of their growth and business strategy. Unfortunately, knowledge sharing (KS) barriers or factors can have a negative influence on a new product development (NPD) project team performance can make it difficult for the organisation to achieve sustained superior performance. The purpose of this research is to identify and explore a set of important KS barriers that might negatively affect the performance of a NPD project team. Specifically, this research focussed on identifying and evaluating the barriers to development and to offer guidelines to decision makers to improve KS to foster effective processes. This research can be utilised by decision-makers to design and develop effective processes and mitigation strategies to ensure effective KS.