This is a 38-page software-engineering practice guide. Using a simplified online bookstore as one continuous example, it explains how a team can use different diagrams before coding begins to clarify the system boundary, user goals, business processes, domain objects, architectural decomposition, data structures, runtime interactions, and production deployment.

What This Document Addresses

Software design has no single “universal architecture diagram” that can answer every question. System context diagrams, UML, BPMN, C4, ER diagrams, and sequence diagrams present different viewpoints and belong to different design stages.

The document uses the same online-bookstore example to introduce:

  • System context, use case, and business process diagrams
  • State machine diagrams, domain models, and UML class diagrams
  • C4 container diagrams and backend component diagrams
  • ER diagrams and sequence diagrams for key business scenarios
  • Production deployment diagrams, relationships between the views, and a pre-coding checklist

Each part explains what the diagram answers, how to read its elements, when to create it, and which common modeling mistakes to avoid.

Intended Readers

The document is intended for readers beginning to learn software development and software engineering. It also suits software developers who want to organize their design methods systematically and establish a shared modeling language within a team.

Read the Full Document

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Which Diagrams Should You Draw Before Coding Starts?

Pages
38
File size
1.1 MB
Document language
Simplified Chinese (zh-CN)

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Which Diagrams Should You Draw Before Coding Starts?

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The complete PDF is currently available in Simplified Chinese. The English and Japanese pages provide corresponding introductory information but do not present this Chinese PDF as a translated document.

Reading Guidance

You can first scan the document’s “diagram map,” then choose chapters according to the current project stage. An ordinary web project does not need to produce every diagram mechanically. What matters more is that each diagram answers a specific question and that the requirements, business, architecture, data, interaction, and deployment views remain consistent.