This paper aims to defend deliberation-compatibilism against several objections, including a recent counterexample by Yishai Cohen that involves a deliberator who believes that whichever action she performs will be the result of deterministic manipulation. It begins by offering a Moorean-style proof of deliberation-compatibilism. It then turns to the leading argument for deliberation-incompatibilism, which is based on the presumed incompatibility of causal determinism and the ‘openness’ required for rational deliberation. The paper explains why this argument fails and develops a coherent account (...) of how one can rationally deliberate and believe in causal determinism without inconsistency. The second half of the paper then takes up Cohen's proposed counterexample and his Four-Case Deliberation Argument against deliberation-compatibilism, which is meant to mirror Derk Pereboom's famous Four-Case Manipulation Argument. In response, the author defends a hard-line reply to FCDA but also argues that the notion of ‘sourcehood’ relevant to rational deliberation differs from that involved in free will. (shrink)