A forecast that affects what actually happens so that it becomes true. This is related to the Pygmalion Principle or, as in My Fair Lady, a woman who is treated like a lady becomes a lady. Rosenthal and Jacobson (1968) present evidence on this phenomenon. In many cases, the effects can be beneficial. Sherman (1980) found that when people were asked how they would respond in a given situation, they tended to cast themselves in a responsible and favorable manner. Then, when later faced with the situation, they tended to live up to their predictions. Scenarios can be used to present forecasts so as to create self-fulfilling prophecies.