For the purpose of this paper, I assume that if a person is morally responsible for an action, this is a necessary and sufhcient condition for moral appraisal of that person for that action. For instance, if the action is morally wrong, moral blame is in order. Other morally relevant responses that are sometimes connected with moral responsibility are praise, pardon, shame, pride, reward, punishment, remorse. I now introduce two quite different concepts of moral responsibility: one grounded on the causal responsibility ofthe agent for an action, the other on the ability of the agent to do otherwise. The one based on the agent’s causal responsibility considers it a necessary condition for praising or blaming an agent for an action, that it was the agent and not something else that brought about the action. The question of moral responsibility becomes one of whether the agent was the or a cause of the action, or whether the agent was forced to act by something else. On this view, actions or choices can be attributed to agents because it is in their actions and choices that the agents, quo moral beings, manifest themselves. The second idea of moral responsibility considers it a prerequisite for blaming or praising an agent for an action that the agent could have done otherwise. This idea is often connected with the agents, sentiments or beliefs that they could have done otherwise, as well as the agents’ feelings of guilt or regret, or pride, for what they have done. Some philosophers consider the causal indeterminedness of the agent’s decision to act as necessary to warrant that the agent could have done otherwise.