This chapter explores some of the key concepts and theories useful for informed consent in information technology, particularly concentrating on those unique to the information technology area, such as trust and numbness. It also discusses previous research done on the problem of informed consent and evaluates some suggestions for frameworks to deal with values in information technology. The chapter then outlines and explores a theory of informed consent for information technology, with a discussion of justification, then an adoption of the informed consent as waiver approach of Manson and O'Neill with adaptations to the theory that take into account the problems particular to the area. In particular, in section 3.2.3 I outline some normative expectations within the specific case study area of software installation and use, and describe how to establish normative expectations outside of that area. I also look at the area of communication channels, discussing the best way to establish an effective communication transfer in order for the consent decision to be successful. Finally I discuss how the theory I recommend improves communication and, ultimately, the experience of giving consent for computer users.