During the Great East Japan Earthquake Disaster, medical team's responses in Iwate Prefecture Disaster Countermeasures Headquarters had many difficulties, especially during first nine days. In this paper we proposed to objectively reveal problems of response activities at the viewpoint of information processing by After Action Review focusing on the activity logs in the time series (chronologies). By using Emergency Support Function (ESF) as a framework of our analysis, we clarified the gap between the task that should be performed and actual conditions in the operation of Japan DMAT from hyperacute phase to subacute phase of medial responses.
