The Window of Opportunity is a mythological window where newly empowered witches who have not decided to whether use their powers for good or evil yet have 48 hours to make the decision. Witches cannot be forced to choose a side, but both sides can entice them. For this reason, evil considers it a flaw in the Grand Design, as they can employ manipulation to lure witches to evil. If the witch does an act of good (such as saving a life), she becomes good, and vice versa.