This ebook examines different contributions to ontological support and knowledge, ambidexterity, mindfulness, entrepreneurship (in a double sense, macroeconomic and managerial), stakeholder theory, and the basis for a general theory of organisations. All of these contributions critically assess different theoretical approaches and/or make original contributions to some of them. The articles on the ontological support of knowledge, ambidexterity, the two studies that address entrepreneurship, and the basis for a general theory of organisations, provide exciting new insights into all these diverse fields, whilst the critical assessment of varying theories are of particular relevance to the research on the stakeholder theory and mindfulness.