 How should an agent deliberating about an act understand the background for her act? She should not adopt a backtracking supposition of her act. Standing on the edge of a cliff, she should not suppose that if she were to jump, she would have a parachute to break her fall. Also, she should not imagine gratuitous changes in her basic desires. She should not imagine that if she were to choose chocolate instead of vanilla, despite currently preferring vanilla, that she would then prefer chocolate. She should imagine that her basic desires are constant as she imagines the various acts she may perform, and, moreover, should adopt during deliberations the pretense that her will generates her act independently of her basic desires and aversions.