During the late 1990s and early 2000s, the belief in a knowledge-based economy has grown; not just amongst academics, but also policy makers, consultants and managers. Nonaka and Takeuchi’s (1995) work The Knowledge Creating Company was among the first to recognise that organisations that manage their knowledge efficiently, have a competitive advantage over organisations that do not succeed in doing so. Based on this understanding, a number of knowledge management frameworks and models have emerged which highlight how to improve the identification, creation, transfer, and documentation of knowledge. These will be discussed further in Chapter 3. This introductory chapter starts with a definition of key concepts and terms, including data, information and knowledge; explicit and tacit knowledge; and the three levels of where knowledge resides (the individual, group, and organisational level). It also briefly explains how processes of managing knowledge at an organisational level can help organisations learn over time, create an organisational memory, and build on what has or has not worked in the past. The concept of knowledge management is thus linked to organisational learning and innovation (Argyris & Schoen, 1978; Gorelick et al., 2004; Senge, 2006). The final section of the chapter provides a range of knowledge management definitions and an overview of the ‘three generations’ of knowledge management.