The moral and forward-looking sense of responsibility is the sense in which one is responsible for achieving (or maintaining) a good result in some matter. The idea is that one is entrusted with achieving or maintaining this outcome, and expected to both have relevant knowledge and skills, and to make a conscientious effort. However, despite one's best efforts, the result may not be achieved. For example, patients of responsible physicians may die, and the work of a responsible engineer may result in an accident because the accident was not foreseeable, it was not possible to compensate for the factors causing the accident, or because others were unwilling to heed the engineer's warnings.
The moral and backward-looking sense of responsibility is that in which a person or group deserves ethical evaluation for some act or outcome, that is deserves moral praise for a good outcome or blame for a bad one. The moral sense of responsibility should not be confused with the causal sense of responsibility for some existing or past state of affairs. For example, when we say that "the storm was responsible for three deaths and heavy property damage," meaning that it caused these outcomes, we do not mean to attribute moral responsibility to the storm. Storms do not have moral responsibilities, and are neither responsible or irresponsible in the moral sense. However, when a moral agent is causally responsible for some outcome, that is some reason to think that the agent is morally responsible for it. Causal responsibility is not conclusive evidence of moral responsibility, however. If one's actions case a terrible outcome only because of bad moral luck, in the form of a freak accident, then one is not morally responsible for the outcome.
Forward-looking responsibilities are often specified in terms of the outcome to be achieved rather than the acts to be performed. It takes judgment to figure out what acts will achieve a given outcome. For this reason you will hear the phrase "the age of responsibility" or "the age of discretion" used to mean an age at which a person is sufficiently mature to exercise such judgment. Such practical wisdom is not required in order to fulfill many obligations which are often specified in terms of the acts to be performed or to be avoided. For example, contrast the engineer's responsibility for the safety of the public with a citizen's obligation to testify when witness to a crime. Notice that "obligation" would never be used in the way "responsible" is, to refer to a virtue of a person. That is, you would not say that so-and-so was an "obligatory" person, though you may say she was "responsible."
Sometimes "responsibility" is used to mean an act one is required to perform, as in "It is your responsibility to take minutes for this meeting." In this Center, the term "responsibility" will be used only for matters that require some exercise of discretion and judgment and required acts will just be called "obligations."
Sometimes "responsible" is used in a phrase of the form "responsible to (some other party), in which the term "responsible" is used as a synonym for "answerable" or "accountable." An example would be: "This citizens' group was accountable/responsible/answerable to its parent organization." This use of the term "responsible" is easily distinguished from the present one which is "responsible for (some matter for which one must exercise discretion)." :right of self-determination The right to choose one's own actions or course of life so long as doing so does not interfere unduly with the lives and actions of others.

This definition is in context to Legal Ethic. See more contextual defintions for Responsibility.