Logical positivism
This distinction between science, which in the view of the Vienna Circle possessed empirically verifiable statements, and what they pejoratively called "metaphysics", which lacked such statements, can be seen as representing another aspect of the demarcation problem. Logical positivism is often discussed in the context of the demarcation between science and non-science or pseudoscience. However, "The verificationist proposals had the aim of solving a distinctly different demarcation problem, namely that between science and metaphysics."