This paper presents a novel approach to dealing with selectional restrictions related to the humanness of external arguments. In particular, two different types of intention are proposed: intention as acting to bring about a result and intention as planning. The two types of intention are explored from the perspective of event structure. In effect, a tripartite event structure which includes a planning subevent corresponds to intention as planning and accounts for the fact that some verbs in English only select human entities as external arguments. Ultimately, the proposed event structure accounts for the grammatical realization of planning as a strictly human property in English.