 According to possibilism, the act-sets that have their deontic status directly (i.e., they do not have their deontic status in virtue of the deontic status of any other act-set) are the act-sets that agents can perform over the course of their entire lives, which we will refer to as maximal act-sets (Åqvist 1969). Moreover, any non-maximal act-set has its deontic status indirectly (i.e., its deontic status is determined by the deontic status of a maximal act-set of which it is a part). In Professor Procrastinate, assuming that Procrastinate cannot perform any acts after doing either \(\langle X\rangle\), \(\langle Y\rangle\), or \(\langle Z\rangle\), possibilists hold that Procrastinate is obligated to \(\langle a\rangle\) because the best maximal act-set she can perform over the course of her life includes \(\langle X\rangle \), and \(\langle X\rangle \)-ing requires \(\langle a\rangle\)-ing.