This paper examined six philosophical paradigms, namely positivism, interpretivism, post-positivism, pragmatism, post modernism and critical realism. The paradigms serve as the bases for knowledge management research and practice. Basing on a critical review of literature and drawing from tacit insights, the paper reveals that positivist managers and researchers tend to focus on explicit knowledge while paying little attention to tacit knowledge. In the same vein, interpretivists focus on tacit knowledge while ignoring explicit knowledge. Even when the post-positivist ontology provides useful insights, many managers and researchers may lack adequate skills to apply such insights in theory and practice. Pragmatism focuses on actions that possess instrumental value, yet there is a tendency to focus on personal value rather than organisational value. Postmodernism highlights the central nature of power structures and power struggle all of which tend to affect knowledge management practices. Critical realism prioritises tacit knowledge as the main source of competitiveness, yet tacit knowledge is insufficient on its own. The paper contributes to the understanding and debate of knowledge management research and practice.