The core content of the fourth chapter of software engineering introduction

The structural design method is developed on the basis of modularization, top-down gradual refinement and structure-based programming technology.  Structured design methods can be divided into two categories, one is based on the data flow of the system design, known as the data flow design or process-driven design, the other is based on the data structure of the system designed to become data-oriented structure design, or data-driven design.  The software design process includes a set of principles, concepts, and practices that can guide high-quality systems or product development. Principles of software Design: Divide and conquer, module independence (coupling and cohesion), improve abstraction levels, reuse design, flexibility design (reduce coupling to improve cohesion, build abstractions, do not write code to die, throw exceptions, use and create reusable code) structured design (cube diagram) is divided into outline design (architecture design,  interface design, data design) and 4 types of detailed design (process design) Modules: Incoming module, outgoing module, transformation module, Coordination module Interface Design Overview: interface design between modules or software components, interface design between software and other hardware and systems, and software-to-human interaction design. Program Flowchart (program diagram) Features: Intuitive, clear, easy to learn and master, 5 kinds of basic control structure: Sequential type, select Type, first judgment, after judgment, multi-condition. Any complex program flowchart is nested by a primitive type.

The core content of the fourth chapter of software engineering introduction