||What is the role of perception in providing rational support for beliefs? Can perceptual states or events provide any rational support at all? According to a traditional foundationalism, perceptual states all by themselves were rationally inert, and only introspective beliefs in which the subjects self-ascribes such states played a role in the justifying external-world beliefs. One of the main issues is whether perception can ever provide rational support for external worlds beliefs, without the help of introspective beliefs. If they can, then several further questions arise. Which beliefs do perceptual states provide justification for? What is the relationship between the beliefs that a perceptual state can justify, and the contents of the perceptual state? Are perceptual states ever sufficient to provide justification, or do they need help from other factors? Which features of the perceptual states are relevant to providing justification? What is the role of concepts in perceptual justification? How is the internal structure of perceptual states related to their rational role? Does consciousness have any special rational role? What difference does it make for the rational role of perception whether disjunctivism, sense-datum theory, intentionalism, or other theories are correct about the nature of perceptual experience? Are the distinctions between perceptual states, events, and processes important for understanding the rational role of perception?