The empirical study of consciousness is a young field still in its pre paradigmatic stage and so in need of a unifying framework. This comparative literature review examines two theories of consciousness, Thomas Metzinger’s the self-model theory of subjectivity and Antti Revonsuo’s Biological realism, theories which both try to provide such a framework for the science of consciousness. This paper gives an overview of some of the more central parts of each theory, along with criticism directed towards them. The paper show that these theories, although on the surface very similar, disagree on some fundamental philosophical questions due to differences in their underlying background assumptions. The theories also slightly differ in their view on some methodological questions, as well as in their view of certain aspects on consciousness.