 Finally, and most importantly, there is the work of the philosopher Michael Bratman (1987), which, although in the first instance aimed at human agents, lays the foundation of the BDI approach to artificial agents. In particular, Bratman makes a case for the incorporation of the notion of intention for describing agent behavior. Intentions play the important role of selection of actions that are desired, with a distinct commitment attached to the actions thus selected. Unless there is a rationale for dropping a commitment (such as the belief that an intention has been achieved already or the belief that it is impossible to achieve) the agent should persist / persevere in its commitment, stick to it, so to speak, and try realizing it,