This paper evaluates G.E. Moore’s foundational 1925 essay, "A Defence of Common Sense," examining his strategy for countering British Idealism, and introducing ordinary propositions known with certainty. The analysis explores Moore’s distinction of Idealism, particularly in the views of F.H. Bradley and J.M.E. McTaggart, by introducing a series of 'truisms'. Additionally, this paper will argue that Moore’s defence of ordinary propositions is persuasive, but fails to provide provide a strong justification for the certainty he assigns to common sense beliefs.

