The Safdar, Umar creator Badir, Yuosre Examination Committee Sununta Siengthai Examination Committee Santoso, Djoen San Examination committee Higher Education Commission (HEC), Pakistan Scholarship Donor Asian Institute of Technology Fellowship Scholarship Donor text series technical report th Pathum Thani, Thailand Asian Institute of Technology 2017 continuing eng 96 leaves : ill. +1 online resource Knowledge is considered as a key success factor of the new product development (NPD) projects. Firms invest their time and other resources to access knowledge from diverse sources to enhance their capabilities. Therefore, this study investigates the ways in which Psychological Safety (PS) can be enacted when individuals engage in knowledge search in NPD projects. Selection of a source of knowledge is a complex phenomenon that is often addressed from an organizational viewpoint; however, we know little about knowledge seeking practices at the individual level. Our aim is to examine knowledge sourcing in NPD teams at the micro-level through the lens of the PS. This study investigated 1339 individuals in 85 software development teams. This study demonstrates that different levels of PS affect the selection of different sources of knowledge, which are divided into three groups: intra team, intra-organization, and extra-organizational resources. Our results showed that individuals with high psychological level are more inclined towards intra-team and intra organizational sources of knowledge. Moreover, individuals with low level of PS due to perceived high interpersonal risks are more inclined towards extra-organizational sources. This study also examined how the functional diversity in team composition moderates the relationship between PS and sources of knowledge. This study explored the implications of these findings for managerial practice. A dissertation submitted in partial fulfillment of the requirements for the degree of Doctor of Philosophy in Management, School of Management Thesis (Ph.D.) - Asian Institute of Technology, 2017 New products Development Knowledge management Teams in the workplace Psychological aspects Asian Institute of Technology. http://203.159.5.9/ait-thesis/detail.php?q=B12910 http://203.159.5.9/ait-thesis/detail.php?q=B12910 210427 20260818134347.0