Learn in the textbookDesign and Analysis Methods and Modeling
DefinitionThe structured method (構造化手法) views a system in units of functions (processes) and designs it by breaking large functions down, level by level, into smaller ones.
ExplanationThe split is based on what the system does, and the data that flows between the resulting functions is sorted out at the same time. A DFD (data flow diagram), for example, is used to draw this flow.
AnalogyIt is like planning a big house cleaning: you go from the whole house to each room, then from each room to single jobs such as mopping the floor or wiping the windows, writing each one down.
Memory hookThink of a building: the structure is its frame. You fix the overall frame first and then work down into the details.