A New Year's Resolution is a commitment that an inividual makes to a project or the reforming of a habit, often a lifestyle change that is generally interpreted as advantageous. The name comes from the fact that these commitments normally go into effect on New Year's Day and remain until fulfilled or abandoned. More socio-centric examples include resolutions to donate to the poor more often, to become more assertive, or to become more economically or environmentally responsible. People may act similarly during the Christian fasting period of Lent, though the motive behind this holiday is more of sacrifice than of responsibility. The new year resolution is one example of the rolling forecast-method of planning. According to this method, plans are established at regular short or medium-term time intervals, when only a rough long-term plan exists.