 Estimated desirability is expected utility. An agent’s probability matrix is an array of rows and columns for acts and states, respectively, with each cell formed by the intersection of an act’s row and a state’s column containing the probability of the state given that the agent is about to perform the act. Before performing an act, an agent may assess the act in light of a decision to perform it. Information the decision carries may affect the act’s expected utility and its ranking with respect to other acts.