This book solves a century-old key problem in the philosophy of science by providing the first successful solution that differentiates between disciplines, claims, and attitudes that are scientific and those that are not. This is of profound social relevance, as sharpening and improving our understanding of the nature of science would benefit human well-being, including in educational, financial, medical, legal, regulatory, and political endeavours. The book executes a multi-criterial scientific demarcation project. This allows for the demarcation not only of science from pseudoscience but also of science from other non-scientific fields. In this way, it provides a unique and intensional scientific demarcation in philosophy of science. This book is of great interest to philosophers of science, epistemologists, educators, and anyone designing policies or deciding matters concerning science, such as legislators, regulators, magistrates, and judges.