Sponsored by the Queen's Awards Research Fellowship Fund, London Business School conducted research into the area of communications effectiveness and knowledge transfer based on a case study at Amersham Health. The purpose of this research was to develop a comprehensive measure of knowledge transfer, explore the relationship between communication vehicles and management practices as methods for fostering knowledge transfer, and, finally, investigate the employee and organizational outcomes associated with knowledge transfer. Based on a triangulation of research methods, which included semi-structured interviews and questionnaires, employees' perceptions towards communications effectiveness and knowledge sharing were analysed. The research then linked employees' experiences to business results. Although there is still a great potential to improve communications and knowledge transfer within Amersham Health, research findings indicate that management practices can and do have a significant impact on employee learning and knowledge transfer, on employee attitudes and beliefs, and ultimately on performance. This report contributes to an understanding of the causes or consequences of knowledge transfer and how to best measure it.