Improving local government planner attitudes is important to promote compact city policy. Existing studies have demonstrated the effectiveness of one-shot lecture (OL) for awareness improvement. For this study, we administered an attitude survey related to compact city policy and analyzed relations between acceptability and individual attributes or difficulties in realizing compact city policy. Thereby, we ascertained OL effects more specifically. Results show the following. 1) Planners with low acceptability consider budgets and expert knowledge as difficulties that can be improved by providing fundamental information related to compact city policy. 2) Planners with originally high acceptability show a slight change in improvement and consider problems at sites such as a lack of understanding of citizens, and coordination among departments as difficulties. 3) Planners who are not improved acceptably even if OL is implemented consider physical problems such as opposition of lawmakers and lack of human resources as important difficulties.
