Learn in the textbookStructured Diagrams for Cause Analysis, Control, and Systematization
DefinitionA logic tree (ロジックツリー) breaks one problem or theme into its component elements, then breaks those into lower-level elements layer by layer.
ExplanationBranching by asking "why?" repeatedly makes it a diagram for digging into causes, and branching by "how?" makes it one for organizing solutions. Splitting each level with no gaps and no overlaps (MECE) prevents both oversights and discussing the same thing twice.
AnalogySplit the reasons your room gets messy into "too much stuff" and "nowhere to put things", break each down further, and you can see where to start.
Memory hookIt joins logic and tree, picturing a line of reasoning as the branches of a tree.