Feature of Business Design Method １．Systematic Way of Thinking and Approach ・Structural Analysis 　－　Card Method　→　Relation of Cause and Effect ・Bird‘s-eye view 　 －　Relational Tree-chart ・Action 　 －　Deductive Approach ２．Problem Finding and Solving ・Solution from Chaos　→　Rearrangement of Qualitative Data ３．Forecasting Future ・Logical Validity from Sensitive Recognition ・Scenario Writing Approach by Business Design Method Structural Analysis by Card Method ①Set “Your own position”　→　To avoid the endless loop ②List up every matters thinkable －By Brainstorming（Truth＋Supposed） ③Post the listed matters in cards（One item a card） ④Relate cards by Cause and Effect ⑤Avoid any skip between a cause and an effect　→　Add supplementary cards Relational Tree-chart Sample（What made the oil-pan broken? ）