In Frankfurt cases, an agent (Jones) performs an action on his own and for his own reasons.

Another influential trend in compatibilism has been to argue that moral responsibility does not require an ability to do otherwise. If this is right, then determinism would not threaten responsibility by ruling out access to behavioral alternatives (though determinism might threaten responsibility in other ways: see van Inwagen 1983: 182–88 and Fischer & Ravizza 1998: 151–168). In a very influential 1969 paper, Harry Frankfurt offers examples meant to show that an agent can be morally responsible for an action even if he could not have done otherwise. Versions of these examples are often c...