DDD、SDD、TDD：三個維度的邊際效益矩陣
軟體團隊常把 DDD、SDD 與 TDD 當成三選一的方法論，但它們其實分別處理領域語言、介面契約與重構風險。本文用三軸矩陣拆解三者在不同複雜度、協作邊界與變更成本下的邊際效益，提供判斷何時投資建模、規格或測試的實用框架，避免把方法論討論變成宗教戰爭。
DDD
DDD, SDD, TDD: A Three-Axis Marginal Return Matrix
DDD, SDD, and TDD address different risks: domain language, interface contracts, and change safety. This matrix shows where each method pays off.
DDD Architecture Refactoring in Practice: From Anemic Models to Self-Validating Aggregates
DDD refactoring guide: migrate business validation to aggregates using event-driven design. Learn root causes, implementation steps, and pitfalls for architects.
DDD 架構改造實戰指南：從貧血模型到自我驗證的聚合根
DDD 架構改造實戰完全指南。從根本原因分析、實施方案設計到三步執行方法的完整講解。教你將業務驗證邏輯從臃腫的 Service 層遷移至自驗證聚合根，透過事件驅動架構解耦複雜的跨模組耦合問題。非常適合資深工程師與架構師深度參考與學習應用實踐。