Primary Aim 1: To determine whether homeless individuals will complete an AD and whether guidance enhances rates of completion. Hypothesis 1: We hypothesize that the MI will result in greater completion rate in this population than most others studied, and that the GI will result in a significantly greater rate than the MI - we anticipate a 20% completion rate in the MI condition and a 50% rate in the GI condition. Primary Aim 2: To determine whether completion of ADs by homeless individuals lead to their use during county hospital care encounters over 18 months after the intervention. Hypothesis 2: We hypothesize that when completed ADs exist, they will be used or documented as part of clinical care at least 70% of the time during county health care encounters.