This whitepaper explains how threat modeling, when done correctly, supports a secure by design approach to modern software development. It outlines why security and privacy must be embedded from the earliest stages, as development teams face increasing threats alongside functional demands. The guide covers the fundamentals of threat modeling, including what it is, who should participate, and why it is essential. It introduces a practical four‑question framework and step-by-step process that includes scoping, diagramming, analysis, and retrospectives. Common pitfalls are highlighted with guidance on how to avoid them. The paper emphasizes collaboration between security and development teams and describes how platforms like Devici help scale consistent, effective threat modeling across organ

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