The research project I propose will contribute to ongoing discussions on this matter in academic and popular writing. It sets itself the task of examining the central problem more comprehensively than has been done to date. I will start by clarifying the concept of 'conscience'. Building on this, I will investigate whether, and to what extent, a person is justified to act on her conscience, irrespective of what her conscience holds. In addition, I will discuss cases in which following conscience becomes problematic in the light of other moral demands.