Alvin M. Schrader is Director of Research for University of Alberta Libraries, Professor Emeritus, University of Alberta, and former Director and Professor in the School of Library and Information Studies at the University of Alberta; e-mail: [email protected]. Ali Shiri is Associate Professor in the School of Library and Information Studies at the University of Alberta; e-mail: ali.sh...

Abstract I stipulate and motivate the overlooked problem of demarcating radical skeptics (perceptual moral) from mentally disordered persons, given that both deny they know ordinary Moorean propositions (e.g., have hands or killing for fun is morally wrong). Call this ‘the demarcation problem’. In response to problem, develop a novel way demarcate between persons in an extensionally adequate sa...