Abstract

This dissertation attempts to defend the justifiability of our belief that there is an external world. I begin by investigating what such a claim means and how it fits in with a common sense "realism." The idea put forth is that the latter asserts not only that there is an external world but also what there is in it. So, the bare assertion about the existence of the external world is only a part of common sense. However, I claim that even such a 'mitigated realism' can be interesting and indicate how Putnam's internal realism amounts to just this. ;I then discuss "epistemological arguments" against realism so defined. These are arguments that begin with the epistemological theses and conclude the denial of realism--a strategy found even in the classic idealist Bishop Berkeley. The steps from such epistemic premises to a metaphysical conclusion are spelled out and the general conception of the epistemological project that underlies and warrants such an inference is explored. What emerges is that to be relevant for metaphysics, epistemic debates must be both non-question-begging and epistemic justifiability must be defined in terms of truth-conduciveness. A model of how epistemology can incorporate these features is suggested. ;The last part of the discussion aims at rejecting the epistemic premises of such anti-realist arguments. This amounts to claiming that an external world is both believable and justified. The arguments of Donald Davidson and Laurence Bonjour claiming to establish this are discussed and criticised. A final vindication, however, is given by reformulating Hilary Putnam's brains-in-a-vat argument. What emerges from the discussion is that just as metaphysics cannot be done in isolation from epistemology, epistemology too cannot be done independently of a theory of intentionality and belief